WO2007136113A1

WO2007136113A1 - Inorganic particle and production method thereof and production plant thereof and paper using it

Info

Publication number: WO2007136113A1
Application number: PCT/JP2007/060624
Authority: WO
Inventors: Takayuki Kishida; Yuichi Ogawa; Yoshiki Hanafusa; Tomohiro Yanagida; Tetsuya Hirabayashi
Original assignee: Oji Paper Co., Ltd.
Priority date: 2006-05-24
Filing date: 2007-05-24
Publication date: 2007-11-29

Abstract

A production method of inorganic particles and equipment thereof which can recycle sludge discharged from industrial plants or processes, especially paper sludge discharged from paper making plants, as coating pigment or paper making filler as paper making materials. The production method of inorganic particles comprises the step of supplying sludge as a material from a sludge supply port (2) installed at the end in the cylindrical shaft direction of a cylindrical heat treating device (1), and the heat treating step of heat treating it by an indirect heating method under an air environment while it is taken out from a sludge discharge port (8) installed at the end opposite to the sludge supply port in the cylindrical shaft direction, characterized in that unburned matter carrying air stream (C) is discharged from the cylindrical heat treating device during the heat treating step so that the unburned matter is entrained in the unburned matter carrying air stream and taken out to be removed from the sludge.

Description

Specification

INORGANIC PARTICLE MANUFACTURING METHOD, MANUFACTURING PLANT, AND PAPER TECHNOLOGY USING THE SAME

TECHNICAL FIELD [0001] The present invention relates to sludge reuse, and relates to a method for producing inorganic particles using a sludge having a suitability as a coating pigment or a papermaking filler, a production plant thereof, and paper using the same.

Background art

[0002] In recent years, from the viewpoint of environmental protection, it has been forced to reduce industrial waste from activities associated with production. Even in the paper industry, the treatment of paper sludge has become a problem. Persludge is wastewater discharged from various processes in the paper mill. (1) Wastewater generated during the washing process in the pulping process, (2) Removal of contaminants from the wastepaper processing process, deinking flotation treatment And wastewater generated during the washing process, (3) wastewater that flows out of papermaking wires as raw material loss during paper manufacture, and (4) various wastewater such as wastewater from biological wastewater treatment processes. As a sludge recovery process for these wastewaters, the solids contained in each wastewater are recovered as sludge by appropriately combining the steps of aggregation, precipitation, concentration, dehydration and the like. The various wastewaters described above may be individually sludge collected to collect various sludges such as deinking sludge, coated paper manufacturing sludge, and biological treatment surplus sludge. The various process sludge discharged from the plant is generically called paper sludge. This paper sludge contains various components derived from paper mill wastewater. For example, lignin and fine fibers extracted in the pulping process, fiber such as pulp derived from raw material loss, starch and synthetic components It contains organic substances mainly composed of adhesives, inorganic substances mainly composed of pigments for coating paper and internal additives, and printing ink derived from waste paper.

[0003] Furthermore, in recent years, paper sludge derived from the deinking process of used paper has been increasing along with an increase in the utilization rate of used paper. Among them, used newspapers and high-quality used papers contain a small amount of inorganic substances (inorganic pigments) in the used papers! Waste paper has a lot of inorganic substances in waste paper. Increases the generation amount of par sludge. This is partly due to the low utilization of used magazine paper compared to used newspaper and high-quality used paper. In the future, in order to further promote the use of waste paper, it will be necessary to improve the utilization rate of magazine waste paper.

[0004] Paper sludge, which also generated paper mill power, was conventionally disposed of in landfills as industrial waste, but recently sludge has been used in incinerators such as fluidized bed furnaces and first-power furnaces. Organic sludge is burned and recovered as energy, while reducing the volume of paper sludge. However, since paper sludge contains inorganic substances, there is a problem that a large amount of residue (incineration ash) remains after combustion. At present, some of the incineration ash is mixed with cement, used as an antioxidant for iron making, and a soil conditioner, but most of it is landfilled as industrial waste. In the future, as waste paper is reused, it is expected that an extremely large amount of paper sludge will be generated and waste disposal will become increasingly difficult, and processing costs that are increasing year by year will increase the revenue of the pulp and paper industry. It is also expected to press. For this reason, in the paper industry that recycles used paper, the problem of paper sludge is extremely serious, and its effective use is strongly demanded as part of its countermeasures. For this reason, if paper sludge incineration ash (inorganic matter) can be reused as a paper filler and coating pigment, which is a papermaking material, it not only reduces industrial waste but also improves the waste paper utilization rate. Can solve the problem of environmental measures. However, these incineration ash cannot be used as it is as a papermaking material because of its low whiteness and high hardness.

[0005] A number of methods for recycling and reusing paper sludge into papermaking materials have been studied for such a social environment.

A method to improve the whiteness of sludge incineration ash by incinerating sludge incinerator ash by recombusting incinerator ash (Patent Document 1), causing combustion of organic materials in sludge. , A method of producing an inorganic material that does not contain organic substances (Patent Document 2), a method that uses a fluidized bed furnace to burn unburnt carbon! /, A method of separating and using sludge incineration ash (Patent Document 3) ), Paper sludge is formed, incinerated with an internal combustion rotary kiln, etc., and pulverized (Patent Documents 4 and 5), paper sludge is granulated, formed, and rotary There has been proposed a method (Patent Document 6) in which organic components are efficiently combusted in a kiln in the drying, carbonization and calcination stages to obtain incinerated ash, and at the same time pulverized and neutralized with carbon dioxide gas. In each of the heat treatment steps of these methods, black carbides in organic matter are completely burned in a firing furnace in order to obtain a fired product with high whiteness, so that the inorganic components are sintered and hardened, and wear resistance is increased. It will get worse. In addition, when firing at a low temperature to prevent the generation of high-hardness compounds of inorganic components, a long treatment time is necessary, and it becomes a large device for treating a large amount of paper sludge, which is not economical. ,.

[0006] Therefore, in order to efficiently burn black carbide in organic matter, paper sludge is first pulverized and then coarsely pulverized, and the remaining organic component in the secondary combustion is combusted and further pulverized (Patent Document) 7), 1-7 The method of burning with an ignition function, and in the secondary combustion, burning while promoting contact with oxygen (Reference 8), the first stage of incinerating organic compounds in paper sludge, and excess oxygen After the second stage heat treatment in which residual carbonaceous material is incinerated under supply, the heat treatment product is made into an aqueous suspension and carbon dioxide is blown (Patent Document 9). After drying the paper sludge, the organic content is removed in a combustion furnace. There have been proposed a method of completely burning and coarsely pulverizing or finely pulverizing into an aqueous dispersion and blowing in carbon dioxide gas (Patent Document 10) and a method of pulverizing between multistage combustion and combustion. In order to achieve both suppression of decomposition of carbonic acid ruthenium and whiteness, a method of injecting carbon dioxide when burning a carbon component (Patent Document 11) has also been proposed. However, these methods are designed so that the calcium carbonate contained in the sludge is not decomposed during the heat treatment! / The equipment for the heat treatment process becomes complicated and requires a lot of cost and energy. It is not economical.

[0007] In order to reduce the hardness of recycled inorganic particles from paper sludge, a slurry of ash particles and calcium hydroxide burned at a high temperature at which the hydrocarbon material in the sludge is oxidized is prepared, and the slurry is There has been proposed a method (Patent Document 12) for producing a composite granular material obtained by carbonating and precipitating calcium carbonate on the surface of ash particles. However, the coating of light calcium carbonate with these calcined ash as the core requires sophisticated and complex operations and management. In addition, there is another problem that the quality of the final product changes due to the influence of the incinerated ash used as a raw material, and the quality is stable. [0008] As another method for reducing the hardness of the regenerated inorganic particles, incineration ash can be mixed and baked with an alkali metal compound to prevent the formation of a high hardness compound, and the mixed baked product can be treated with acid to form amorphous silica. A method for producing fine particles (Patent Document 13) has been proposed. A method for producing porous granules in which incinerated ash is contained in caustic acid by immersing the incinerated ash in an alkaline solution containing caic acid and neutralizing it with an acid has been proposed (Patent Document 14). ing. These methods allow reuse by converting sludge into functional materials, but do not reach the disposal of large amounts of paper sludge and cannot significantly reduce the amount of waste processed. .

[0009] In addition, as a method of performing carbonization before the paper sludge combustion treatment, a method of carbonizing the paper sludge at about 350-700 ° C and then combustion treatment at 650-800 ° C (Patent Document 15), A method of carbonizing paper sludge under low oxygen conditions (preferably under oxygen-free conditions) at a temperature of less than 600 ° C and then combusting at 600 to 800 ° C (Patent Document 16). After carbonization at 1000 ° C or lower, 450 ~; Method of burning at 1000 ° C (Patent Document 17), Paper sludge is gradually heated from 200 ° C in one kiln and dried. For example, a method of carbonizing at 600 ° C. and then further heating and firing at 850 ° C. (Patent Document 18) has been proposed.

[0010] On the other hand, as a method for carrying out a combustion process under specific conditions without carbonizing the papermaking sludge, the deinking sludge content in the papermaking sludge is reduced to 700 ° C or lower using a cyclone furnace. Combustion treatment within 10 seconds, followed by 27 fire combustion process at 700 ° C or less (Patent Document 19), incinerated ash obtained by incinerating paper sludge at 800 ° C, 500 ~; 110 0 A method of burning again at ° C (Patent Document 19), and a method of combining dry oxidation and wet oxidation into sludge incineration ash, wet oxidation of papermaking sludge at 200 to 800 ° C, followed by 800 to 1100 ° C dry oxidation A method of wet oxidation after treatment or conversely dry oxidation (Patent Document 20) has also been proposed!

Patent Document 1: Japanese Patent Laid-Open No. 11 310732

Patent Document 2: Japanese Patent Publication No. 10-505055

Patent Document 3: Japanese Patent Laid-Open No. 2001-11337

Patent Document 4: Japanese Patent Laid-Open No. 2002-167523 Patent Document 5: Japanese Patent No. 3611830

Patent Document 6: Japanese Unexamined Patent Application Publication No. 2004-176208

Patent Document 7: Japanese Unexamined Patent Publication No. 2001-262002

Patent Document 8: Japanese Unexamined Patent Publication No. 2005-53984

Patent Document 9: JP-A-10-29818

Patent Document 10: Japanese Patent Laid-Open No. 2002-356629

Patent Document 11: Japanese Unexamined Patent Application Publication No. 2004-262701

Patent Document 12: Japanese Patent No. 3274141

Patent Document 13: Japanese Patent Laid-Open No. 2001-348510

Patent Document 14: Japanese Unexamined Patent Publication No. 2003-71404

Patent Document 15: Japanese Unexamined Patent Application Publication No. 2005-161239

Patent Document 16: Patent No. 3563707

Patent Document 17: Japanese Unexamined Patent Application Publication No. 2002-308619

Patent Document 18: Japanese Unexamined Patent Application Publication No. 2004-176209

Patent Document 19: Patent No. 3831719

Patent Document 20: JP 2001-026727 A

Disclosure of the invention

Problems to be solved by the invention

[0012] The present invention provides a large amount of sludge discharged from an industrial plant or process, in particular paper sludge power, as inorganic particles for coating pigments or paper fillers. To provide an efficient method for producing inorganic particles, and to provide a production plant using the same and paper using the same.

[0013] Paper sludge that needs to be processed is expected to eventually reach several hundred to thousands of tons per month. However, in each of the conventional methods for treating paper sludge, a large amount of paper is used in any of them. In addition to being able to treat sludge efficiently, it was difficult to obtain sludge incineration ash with high whiteness and high quality. The reason is presumed as follows.

[0014] First, sludge incineration ash to be reused for papermaking materials should be as white as possible when blended with white paper. It is important to remove organic components (so-called carbides such as soot and charcoal) as much as possible. However, the higher the waste paper utilization rate, the more carbon black derived from printing ink contained in papermaking sludge. In addition, this carbon black derived from printing ink is carefully carbonized so as not to leave ignitable impurities in order to eliminate the risk of ignition and explosion as a black pigment! , It becomes a property that is much harder to burn than originally!

[0015] On the other hand, a general organic component has a molecular structure mainly composed of a carbon molecular chain. If the molecular structure has a functional group such as a carboxyl group, a hydroxyl group, an ester group, or an ether group, Starting from this functional group part (reaction starting point), thermal decomposition and combination with oxygen (ignition, oxidation, combustion) are promoted. Therefore, the organic component having the functional group ignites at a relatively low temperature, and can be easily removed by combustion by supplying sufficient oxygen while maintaining the temperature. In addition, even if most of the organic component does not have the functional group, when the organic component having the functional group is contained as a minor component such as an impurity, the functional group portion of the small amount of the organic component is not contained. Since it is the starting point for thermal decomposition and combustion, it can still ignite at a relatively low temperature, and the organic components can be easily removed by combustion by supplying sufficient oxygen while maintaining that temperature.

[0016] On the other hand, carbides represented by soot and charcoal are obtained by sintering (carbonizing) organic components in an oxygen-poor atmosphere. It changes to a bond graphite structure (= C = C = C = C =), and it loses most of the functional groups in the molecular structure, making it extremely difficult to ignite.

[0017] However, in the conventional method in which carbonization is performed before the paper sludge is burned, carbonization is performed up to organic components that are originally easily burned in addition to carbon black derived from used printing ink. Therefore, it is irrational from the viewpoint of combustion treatment, and it is actually difficult to obtain inorganic particles with high whiteness as well as poor combustion efficiency.

[0018] Further, according to the study by the present inventors, when the organic component is suddenly raised to a temperature exceeding 650 ° C, only the functional group contained in the molecular structure and its peripheral part are first. It is known that the organic components are burned out rapidly, and the organic components lose their starting point of ignition and thermal decomposition, and become extremely incombustible, similar to carbides. [0019] Therefore, in both of the conventional methods in which the papermaking sludge is subjected to the two-stage combustion treatment without carbonizing, the organic component is initially set in order to set the first stage combustion temperature to a temperature exceeding 650 ° C. X is said to be irrational and inefficient.

[0020] In Ikenami Shoten, 4th edition of RIKEN, the thermal decomposition of pure calcium carbonate is assumed to be 898 ° C (dissociation pressure latm)! However, according to JISP8251 (2003), it is actually known that calcium carbonate in paper undergoes thermal decomposition at a temperature exceeding about 525 ° C, which is lower than the above temperature. In addition, the method of suppressing the thermal decomposition of calcium carbonate in paper sludge by the two-stage combustion process in which the first stage combustion temperature is 750 ° C or less and the second stage combustion temperature is less than 800 ° C as described above. Generally, when calcium carbonate (CaC 2 O 3) is 525 ° C or higher, carbon dioxide gas (CO 2) is released and converted to calcium oxide (CaO)

3 2

Because of its properties, it suppresses the thermal decomposition of calcium carbonate that occurs at a temperature lower than the combustion temperature (525 ° C) while removing the organic components in the sludge at a combustion temperature of 600 ° C or higher. Therefore, it must be inefficient and is not suitable for obtaining the desired high-grade sludge incineration ash at a high rate.

[0021] Note that the conventional method of performing multi-stage oxidation treatment by combining dry oxidation and wet oxidation with papermaking sludge complicates the treatment process and treatment equipment, and thus the treatment cost is very high, and a large amount of papermaking sludge is produced. Not suitable for combustion treatment.

[0022] In view of the above-mentioned situation, the present invention efficiently uses high-quality white inorganic particles that can be effectively used as a papermaking filler or a coating pigment for papermaking materials from papermaking sludge discharged from a papermaking factory. The aim is to provide a method and plant that is well economical and large-scale.

Means for solving the problem

[0023] In order to solve the above-mentioned problems, the present invention first employs the invention according to claims;! That is, the present invention according to claim 1 supplies sludge as a raw material from a sludge supply port installed at the end of the heat treatment apparatus, and a sludge discharge port installed at the end opposite to the sludge supply port. A method for producing inorganic particles comprising a heat treatment step of heat treatment by an indirect heating method in an excess air atmosphere during removal from the container, the heat treatment step The unburned matter carrying air flow is discharged by the heat treatment apparatus by discharging the unburned matter on the unburned matter carrying air flow to remove sludge force. It consists of a method.

[0024] It is preferable to use a cylindrical heat treatment apparatus as the heat treatment apparatus because the heat treatment apparatus can be reduced in scale. Furthermore, by dividing the inside of the cylindrical heat treatment device, the sludge stacking 'deposition is reduced, so that more sludge treatment can be performed and the heat treatment device can be made smaller! /.

[0025] Further, in the heat treatment step, forcibly discharging the unburned matter conveying air stream from the vicinity of the sludge supply port effectively removes unburned matter as unburned matter conveying air. It is preferable for taking it out of a stream.

[0026] Further, the air for generating the air flow for transporting the unburned matter is sucked from the air supply loca provided in the vicinity of the sludge discharge port of the heat treatment device, so that the unburned matter is effectively unburned. It is preferable for taking it out on the air flow for conveying goods.

[0027] Further, it is preferable that the heat treatment step is performed at a sludge temperature of 600 to 850 ° C in order to appropriately perform the heat treatment, that is, to burn the sludge.

[0028] Furthermore, it is preferable that the calcium carbonate in the sludge treated in the heat treatment step is decomposed in excess of 50%.

[0029] Further, after the heat treatment step, the calcined product obtained in the heat treatment step is mixed with water and stirred to form a calcined product suspension into a calcined product suspension. And further comprising a carbonation step in which carbon dioxide is brought into contact, it is preferable to use the resulting inorganic particles as a coating pigment or a papermaking additive.

[0030] The inorganic particles of the present invention are inorganic particles produced by the production method described above, and are preferred as inorganic particles for coating pigments or paper fillers as papermaking materials.

[0031] The manufacturing plant of the present invention supplies sludge from the sludge supply port at the end of the cylindrical heat treatment apparatus in the cylinder axis direction, and is installed at the end opposite to the sludge supply port in the cylinder axis direction. A cylindrical heat treatment apparatus that heat-treats by an indirect heating method in an excess air atmosphere while being taken out from the sludge discharge port, and has an exhaust means for generating an unburned material carrying air flow as the sludge supply port. In the vicinity, unburned material from the fired sludge after heat treatment An inorganic particle production plant including a heat treatment apparatus configured to discharge an unburned matter carrying air stream so as to be put on and taken out.

[0032] The present invention relates to a paper using the inorganic particles as a filler. The present invention also relates to a coated paper using the inorganic particles as a facial material.

[0033] The present invention also employs the inventions according to claims 16 to 27 as means for solving the prior art. Among these, the method for producing inorganic particles according to claim 16 is a method for producing inorganic particles by using papermaking sludge as a raw material and carrying out a combustion treatment while being transferred through a cylindrical heat treatment furnace, wherein the combustion treatment comprises: A primary combustion process that burns and removes flammable organic components in sludge under an excess air atmosphere at a sludge temperature of 650 ° C or lower, and a non-combustible organic in sludge at a sludge temperature of 700 to 850 ° C in an excess air atmosphere It is characterized by undergoing at least two stages of combustion processes, including a secondary combustion process in which components are removed by combustion.

[0034] Further, in the method for producing inorganic particles, the cylindrical heat treatment furnace is a rotary kiln furnace, the structure of claim 17, the structure of claim 18 in which the combustion treatment is performed by indirect heating, and at least 2 of the above The configuration according to claim 19, wherein the staged combustion process is set during the transfer process of one cylindrical heat treatment furnace, by forcibly discharging the furnace air from the raw material supply port side at one end of the cylindrical heat treatment furnace, The structure according to claim 20, wherein air is sucked into the furnace from the calcined product outlet side of the other end, in addition to the air suction from the calcined product outlet side, from the 17 fire combustion process to the secondary combustion process. The configuration according to claim 21, wherein air is also sucked into the furnace at the transition part, and the indirect heating part for the seven-fire combustion process and the indirect heating part for the secondary combustion process are separated from each other, The composition according to claim 23, wherein an alkali metal compound is added to the raw papermaking sludge. 25. The configuration of claim 24, wherein the paper sludge is granulated or formed into a lump, and the combustion treatment decomposes 50% or more of calcium carbonate contained in the paper sludge as a raw material, the combustion treatment The subsequent baking product is mixed with water and stirred to form a suspension, a carbonation step in which carbon dioxide is brought into contact with the suspension to obtain a carbonized product, and the carbonization treatment A configuration according to claim 26 including a pulverizing step of pulverizing an object is a preferred embodiment.

On the other hand, the inorganic particle production plant according to claim 27 of the present invention includes a cylindrical heat treatment furnace having one end side as a raw material supply port and the other end side as a fired product discharge port, and papermaking sludge to the raw material supply port. The Raw material supply means to be supplied, transfer means for transferring the supplied sludge to the fired product outlet side, indirect heating means for bringing the inside of the cylindrical heat treatment furnace into a combustion state, and excess in the cylindrical heat treatment furnace Air supply means for making an air atmosphere, and the above-mentioned cylindrical heat treatment furnace is composed of a 17-fire combustion section with a sludge temperature of 650 ° C or less and a secondary combustion section with a sludge temperature of 700-850 ° C The air supply means forcibly exhausts the air in the furnace from an exhaust port provided in the vicinity of the raw material supply port of the cylindrical heat treatment furnace, thereby providing an air supply provided in the vicinity of the fired product discharge port of the cylindrical heat treatment furnace. As a means to inhale air and air into the furnace!

The invention's effect

[0036] According to the method for producing inorganic particles according to claims 1 to 11 and the production plant according to claim 12, a high whiteness and high hardness composite can be obtained by efficient heat treatment using a large amount of sludge as a raw material. Inorganic particles suitable as paper fillers and coating pigments can be obtained

Yes

[0037] That is, the decrease in the whiteness of the sludge incineration ash is mainly caused by the mixed black carbide particles, but even if such carbide particles are included in the raw material sludge, it is common knowledge in the heat treatment step. It must burn and burn as carbon dioxide while being transferred to the outlet along with the sludge. However, the carbide particles remain in the sludge incineration ash obtained by the conventional method because the carbide particles scattered and suspended in the gas phase in the heat treatment apparatus immediately reach the outlet immediately before burning and are discharged from the outlet. In addition to the force and carbide particles originally existing in the raw material sludge, such as carbon black, the organic matter in the sludge burns in the heat treatment process. Therefore, it is assumed that contamination of unburned carbide particles in the heat-treated product was unavoidable with the conventional method.

[0038] On the other hand, in the method for producing inorganic particles according to the claims of the present invention;! To 11, the carbide particles scattered in the gas phase in an excess air atmosphere in the heat treatment apparatus are easily burned and are not floated. Since the burned carbide particles are taken out on the air flow for conveying the unburned material, it is possible to effectively prevent the unburned carbide particles from being mixed into the heat-treated product.

[0039] When the heat treatment apparatus is a cylindrical type as in claim 2, particularly a single straight tubular type furnace as in claim 3, and further a rotary kiln furnace as in claim 8, the equipment configuration Will be simplified On the other hand, the space from the first half of the heat treatment process, where the proportion of organic matter in the sludge is high and the amount of soot generated due to intense combustion, increases directly from the outlet to the outlet. However, the contamination is prevented by the air flow for conveying unburned matter. In particular, by setting the supply / discharge position of the air flow for transporting unburned matter as in claims 5 and 6, the air flow force for transporting unburned matter becomes counter-current to the moving direction of sludge and floats. Since unburned carbide particles are returned to the sludge supply port side, contamination of unburned carbide particles into the heat-treated product is more reliably prevented. In addition, since the carbide particles not mixed in the gas phase but transported in the sludge can be burned and burned out before reaching the outlet, the counter-current unburned material transport air flow can be used. There is no problem even if the carbide particles returned to the sludge supply port move into the sludge. In addition, the organic matter in the sludge is reduced in the later stages of the heat treatment process, and the amount of soot generated by combustion is reduced, and there is no concern that the carbide particles floating near the outlet will move into the sludge and remain. .

[0040] On the other hand, by setting the sludge temperature in the heat treatment step to 600 to 850 ° C as in claim 9, the generation of a hard sintered product can be avoided. As described in claim 10, as a heat treatment condition in which 50% or more of the calcium carbonate in the sludge is decomposed, burnout due to combustion of organic substances can be more reliably performed. In addition, the calcium oxide generated by the decomposition of calcium carbonate in the heat treatment step can be returned to calcium carbonate again through the baked product suspension step and the carbonation step after the heat treatment step as in claim 11. .

[0041] Therefore, the inorganic particles according to claim 13 obtained by the production method and production plant of the present invention have high whiteness and do not contain a high-hardness composite, and are highly suitable as a papermaking filler and a coating pigment. have. The coated paper according to claim 14 coated with a coating solution containing such inorganic particles can provide excellent surface smoothness, opacity, and a fast ink set. Further, the paper of claim 15 using the inorganic particles as a filler is excellent in opacity and sublimation.

[0042] According to the method for producing inorganic particles according to claim 16, the raw papermaking sludge is transferred in the cylindrical heat treatment furnace, and at least two of the one-fire combustion process and the secondary combustion process are performed under specific conditions. High quality white inorganic particles are efficiently produced on a large scale because the combustion process is performed through a staged combustion process. Can be manufactured. In other words, in the first seven-fired combustion process, a combustion process is performed at a sludge temperature of 650 ° C or less in an excess air atmosphere. Organic components having functional groups such as carboxyl, hydroxyl, ester, ether, etc. are efficiently burned without carbonization by promoting thermal decomposition and ignition / combustion starting from the functional group. As the flammable organic component disappears, the flammable organic component also burns with the functional group. In the secondary combustion process, combustion treatment is performed at a sludge temperature of 700 to 850 ° C. in an excess air atmosphere, so that it is difficult to remove carbon black derived from printing ink remaining at the end of the primary combustion process. Combustible organic components are also reliably burned and eliminated, and the formation of hard sintered products due to excessive high-temperature combustion can be avoided.

[0043] Accordingly, the obtained inorganic particles do not contain carbides such as soot and charcoal, so they have high whiteness and do not contain hard sintered products, and are used as papermaking materials and papermaking fillers and coating pigments. High quality suitable for In addition, such a combustion process of at least two stages can surely prevent the conversion of easily combustible organic components into difficult-to-combust organic components, resulting in high combustion efficiency. It becomes possible to process well economically.

[0044] In the configuration of claim 17, since the rotary kiln furnace is used as the cylindrical heat treatment furnace, the setting of the primary and secondary combustion processes is facilitated. In the configuration of claim 18, since the combustion process is performed by indirect heating, the temperature control in the primary and secondary combustion processes becomes easy. In the configuration of claim 19, since the primary and secondary combustion steps are performed in one cylindrical heat treatment furnace, it is advantageous in terms of equipment efficiency and equipment cost.

[0045] In the configuration of claim 20, since air is sucked into the furnace from the fired product discharge port side by exhaust on the raw material supply port side of the cylindrical heat treatment furnace, the flow of air and the flow of the processed material in the furnace are On the contrary, even if unburned flame-retardant organic components are in the state of soot depending on the operating condition of the furnace or sludge, and if they are scattered in the furnace, the airborne material such as soot will get on the flow of air. It is then returned to the raw material supply port side, or further exhausted and discharged outside the cylindrical heat treatment furnace, and the mixture of unburned flame retardant organic components into the fired product is prevented. Whiteness is higher. In the structure of claim 21, the excess air atmosphere in both combustion processes can be easily set by the intake air at the transition from the 17-fire combustion process to the secondary combustion process. In addition, the temperature of the 17 combustion process can be controlled by the amount of intake. In the structure of claim 22, since the indirect heating section for the 17-fire combustion process and the indirect heating section for the secondary combustion process are separated, temperature control of both combustion processes can be easily performed independently. Yes.

[0046] In the configuration of claim 23, since the alkali metal compound is added to the raw paper sludge, the alkali metal compound acts as a kind of catalyst in the combustion process, and the thermal decomposition and combustion of the organic component are further improved. Facilitate. In the structure of claim 24, since the raw papermaking sludge is granulated or formed into a lump shape, the contact strength between the papermaking sludge and air is increased during the combustion process, and the combustion efficiency of organic components is increased accordingly. Will improve.

[0047] In the configuration of claim 25, the combustion treatment! /, And pyrolytic decomposition of 50% or more of the carbonic acid rusium contained in the paper sludge of the raw material is most effective for the combustion removal of organic components in the sludge. Therefore, rational and efficient papermaking sludge treatment can be performed.

[0048] In the configuration of claim 26, since the post-treatment is performed by suspending the burned product after the combustion treatment in water and blowing the carbon dioxide gas for carbonation, the raw papermaking sludge contains calcium carbonate. In addition, calcium oxide converted from the calcium carbonate in the combustion process can be returned to calcium carbonate through calcium hydroxide, and various problems due to the presence of calcium oxide in the inorganic particles obtained can be avoided.

[0049] On the other hand, according to the invention of claim 27, a production plant that can be particularly preferably applied to the production of the inorganic particles is provided.

BEST MODE FOR CARRYING OUT THE INVENTION

[0050] One embodiment of the method for producing inorganic particles and the production plant according to the present invention according to claims;! To 12 is as illustrated in FIGS.

First, the basic flow of the manufacturing method of the present invention will be described with reference to FIG.

FIG. 1 is a diagram showing a basic flow sheet of a method for producing inorganic particles using the sludge of the present invention as a raw material. The following description will be made according to the basic flow sheet.

[0052] [Sludge]

Sludge is a raw material for inorganic particles according to the present invention. Raw material paper sludge is a combination of processes such as agglomeration, precipitation, concentration, and dehydration as a sludge recovery process for wastewater discharged from various processes in the paper mill, such as pulping, paper manufacturing, and used paper recycling. The The solids (various types of paper sludge) obtained by collecting the solids contained in each wastewater can be used alone or as a mixture and appropriately used as raw material sludge. Among these, sludge from the used paper recycling process is agglomerated with the deinking waste liquid separated and discharged from the used paper pulp by pressurized flotation (floatation or flotation) and / or washing in the used paper deinking process. It is recommended to perform dehydration and collect the solid content in the deinking wastewater as deinking sludge. In addition, when recovering sludge from wastepaper raw materials with low whiteness, it is advisable to sufficiently perform deinking and flotation in the wastepaper recycling process to remove as much ink particles as possible, including carbon black. If necessary, multiple sludge pressurization and / or washing steps can be added. The deinking sludge collected from the wastepaper deinking process is separated into high-quality wastepaper, newspaper wastepaper, magazine (coated paper) wastepaper, etc., and deinking sludge is prepared for each type of wastepaper. The deinked waste paper classified by type of waste paper can be used as a raw material sludge as appropriate, either alone or in combination.

[0053] The inorganic component (ash) in the papermaking sludge is a main component in which kaolin (clay) and calcium carbonate derived from papermaking fillers and coated paper pigments account for about 80 to 95% by weight of the total inorganic components. It contains a small amount of talc, titanium dioxide, etc. The ratio of kaolin, which is the main component of the inorganic component, and calcium carbonate varies slightly depending on the type of waste paper to be treated, etc. The weight ratio of kaolin / calcium carbonate is generally in the range of 20/80 to 80/20. . In addition, calcium (CaO equivalent), aluminum (AlO equivalent) and silicon (SiO equivalent) in each inorganic component (ash)

2 3 2

(Um / aluminum / caenium) is 13-73 / 12-40 / 15-47.

[0054] The ratio of the organic component and the inorganic component in the papermaking sludge varies somewhat depending on the type of waste paper to be treated and the deinking process, but the weight ratio of the inorganic component / organic component is generally 30/70. It is in the range of ~ 80/20.

[0055] Apart from sludge, RPF (Refused Paper & Plastic Fuel), mainly low-grade waste paper that is difficult to reuse as a papermaking material and its associated plastic, is used as a raw material.

[0056] Examples of methods for recovering raw material sludge from wastewater from various processes as solids include methods such as filtration, centrifugal separation, pressure dehydration, and squeezing. Get water-making paper sludge. As a suitable filtration device, there is a filtration device called a rotary screen, and as a dehydration device, there is a pressurization / squeeze dehydration device called a screw press, and these filtration devices and squeezing devices are used alone or Combinations can be used as appropriate.

[0057] The solids concentration in the sludge varies depending on the capacity of the dehydrator, so it is usually 5 to 60% by mass. However, if the solid content exceeds 60% by mass, the capacity of the current dehydrator or concentrator It is difficult to achieve.

[0058] [Drying process]

In the present invention, the solid concentration of sludge used in the heat treatment step is not particularly limited, but from the viewpoint of reducing energy costs during the heat treatment step and from the viewpoint of reducing the heat treatment apparatus, the sludge solid concentration is Since it is preferable to make it as high as possible, it should be 70% or more. However, although only the above-mentioned dehydration process varies depending on the capacity of the dehydrator, the solid content concentration is approximately 5 to 60% by mass, so it is recommended that the solid content concentration be further increased by drying treatment. .

[0059] In order to increase the solid content concentration of the sludge, it is preferable to provide a drying step for drying the sludge before the heat treatment step, as shown in FIG. The dryers used in the drying process are not limited to direct heating rotary kilns, indirect heating rotary kilns, air dryers, fluidized bed dryers, vibratory fluid dryers, rotary / aeration rotary dryers (cyclones), etc. The power to use is S. Further, as the heat source of these dryers, it is possible to reduce the energy cost by using the exhaust heat of the baking treatment process described later.

[0060] The temperature of the drying process is 60 ° C in order to prevent sludge from burning and carbonization in an apparatus that uses hot air such as an airflow dryer or a rotary 'aeration rotary dryer'. It is particularly preferable that the temperature be 250 ° C or less. If the hot air temperature is too high, sludge will ignite, and if the firing conditions are not appropriate, the combustible organic components may be carbonized and become non-combustible. Also, in the drying process, to improve the drying efficiency, sludge is forcibly removed with a stirrer or mechanical roll, etc., where it is preferable to unscrew the sludge. It is preferable to classify to about m and dry. [0061] The sludge used in the heat treatment step of the present invention is not particularly limited as long as it has a size and shape that can come into contact with oxygen when the sludge is laminated in the heat treatment apparatus. However, if the sludge is made fine and the size is uniform, the sludge is layered like a close packing, and oxygen does not enter the layer, so the burning of organic matter, especially carbon, becomes insufficient and the whiteness does not improve there is a possibility. If the sludge is too large, the carbon cannot be burned completely and unburned carbon may remain in the center of the sludge lump. From the above, the sludge used in the present invention preferably has a length or diameter in the range of 2 mm to 30 mm. As the shape, a cylindrical shape, a spherical shape, an ellipse, a triangle, another polygonal shape, or an uneven shape can be used.

[0062] In order to form the sludge into the desired size and shape as described above, it is possible to perform granulation. Sludge can be granulated by using a compression molding machine such as a rivet machine or roller compactor, a method using a semi-dry granulator such as a disk pelleter, a rolling granulation method or a stirring granulation method, There are extrusion molding methods.

[0063] Even if the sludge is not granulated using the granulation molding machine as described above, the size can be increased with a screw feeder or the like when the hydrous sludge is charged into the dryer or the dried sludge is charged into the heat treatment apparatus. It is also possible to adjust. It is also possible to adjust the size and shape with a sludge dryer.

[0064] Processing step

When the heat treatment step of the present invention is performed in an excess air (oxygen) atmosphere, the combustion efficiency is improved, so that the heat treatment apparatus can be reduced in size and labor can be saved. The heat treatment temperature is controlled by a method to be described later so that ink pigments such as carbon black in sludge and organic substances such as fibers and polymers can be stably burned.

An example of a heat treatment apparatus used for such a heat treatment step is shown in FIG. FIG. 2 is a configuration diagram of a heat treatment apparatus using an indirect heating type rotary kiln used in the heat treatment process of the present invention.

[0066] The firing furnace that is the main part of the heat treatment process is not particularly limited. Box furnaces such as tunnel kilns, roller hanger kilns, pusher kilns, shuttle kilns, vertical cylindrical furnaces, rotary horizontal cylindrical furnaces, screws A horizontal horizontal cylindrical furnace or the like can be used. Provide sludge There are batch and continuous methods of feeding, but the continuous method is preferred because it can process a large amount. It is preferable to use a rotary horizontal cylindrical furnace that has good heat transfer to the sludge and allows the sludge in the heating furnace to come out to the surface more uniformly or a screw type horizontal cylindrical furnace that can flow. A rotary kiln that is a rotary horizontal cylindrical furnace that is as simple as possible from the viewpoint of maintenance of the equipment and requires less driving energy is preferable. Cylindrical and hexagonal types can be used for the rotary kiln firing chamber. As rotary kilns, external heating continuous rotary kilns from Takasago Industry Co., Ltd., continuous external heating rotary kilns IRK type from Kurimoto Steel Works, indirect heating continuous rotary kiln RKC-SG type from Noritake Engineering Co., Ltd., It is possible to use an externally heated rotary kiln manufactured by Iwasa Machinery Co., Ltd. In addition, by providing a lifter and a rotationally driven stirring member in the kiln furnace, more sludge and oxygen are in uniform contact with each other, so that the organic matter is burned efficiently and the whiteness of the sludge burned product is improved. It is more preferable because it improves and makes the quality uniform. In addition, the multi-cylinder kiln and the kiln firing chamber have a multi-partition partition structure, which increases the heat transfer area, reduces sludge stacking in the kiln furnace, and reduces sludge contact with oxygen. Since heat transfer to the sludge is improved, the whiteness of the sludge fired product is improved, and uniform quality can be obtained. In addition, since the firing chamber has a multi-partition partition structure, sludge stacking / deposition can be reduced as described above compared to conventional kilns, so that a large amount of sludge can be treated. Can be scaled down. The number of divisions in the firing chamber is not particularly limited, but is preferably 6 divisions or more, and more preferably 10 divisions or more.

[0067] Therefore, the heat treatment apparatus using these firing furnaces that can be suitably used in the heat treatment apparatus used in the heat treatment process of the present invention uses a horizontal or vertical cylinder! / It is called a processing device.

FIG. 2 shows a configuration diagram of an example of a heat treatment apparatus preferably used in the heat treatment step of the present invention. As shown in Fig. 2, sludge S, which has been subjected to dehydration, drying, and granulation treatment alone or in combination, is sent from a drying device (not shown) and is an example of a cylindrical heat treatment device. The rotary kiln 1 is introduced into a supply hopper 2 serving as a sludge supply port installed at one end in the cylinder axis direction, and is rotated through a screw feeder 10. It is supplied to the firing chamber 9 in Run 1. As the sludge S passes through the firing chamber 9 of the rotary kiln 1, the organic components therein are combusted. The sludge S after combustion is taken out of the furnace through a sludge discharge port 8 installed at the end opposite to the cylinder axis direction with respect to the sludge supply port, and sent to the next process.

[0069] An exhaust fan 4 is installed as an exhaust means in the vicinity of the supply hopper 2, and the exhaust fan forcibly exhausts the air in the rotary kiln 1 to the rotary kiln 1 and in the vicinity of the sludge discharge port 8. Air is drawn into the rotary kiln 1 from the installed air supply port 3 as shown by the dashed arrow A. In this way, the air flow indicated by the broken-line arrow A from the air supply port 3 toward the exhaust fan 4 always occurs. This air flow becomes an air flow A for conveying unburned matter, which will be described later. This air amount control is performed by controlling the exhaust amount of the exhaust fan 4. This amount of air is preferably controlled so as to be excessively sucked so that the inside of the furnace is in an excess (rich) oxygen atmosphere. Details of this will be described later.

The heat for heating the inside of the rotary kiln 1 is mainly supplied from the indirect heating means 5. The inside of the firing chamber 9 is indirectly heated by this heat. The heat generated by burning combustible components in the sludge in the firing chamber 9 of the rotary kiln 1 S, the heat supplied from the indirect heating means 5 is much greater than this heat . By controlling this indirect heating means 5, the temperature in the rotary kiln 1 is kept uniform. As the indirect heating means 5, heating with a combustion gas of power kerosene or heavy oil, which can be electrically heated, or heating with a gas burner is economically preferable. Combustion exhaust gas discharged from existing incineration facilities can be used, and steam can also be used. In the example shown in FIG. 2, the combustion exhaust gas is supplied as indirect heating means 5 by the circulation blower 17.

[0071] The organic component in the sludge is basically burned in the firing chamber 9 of the rotary kiln 1 and a part of the unburned matter is taken out from the rotary kiln 1 on the air stream A. Since the air flow forcedly exhausted through the exhaust fan 4 is hot air, it is preferable to use the hot air circulation fan 6 to be blown to a sludge dryer (not shown) and reused as heat energy.

[0072] As described above, the heat treatment step of the present invention is uniform in an excess air (oxygen) atmosphere. It is performed by an indirect heating method capable of controlling the temperature. The indirect heating method is a method of heating the firing chamber (inside the furnace) 9, and the indirect heating type combustion furnace prevents direct contact between the hot air generated by the combustion gas or combustion gas and the sludge. It is called this because there is a partition wall. As another heating method, there is a direct heating method in which a flame, combustion gas, or hot air is blown from one end of a cylinder. Since the direct heating type firing furnace is a method of heating from one end of the firing chamber (inside the furnace), the temperature differs greatly between the heating side and the opposite side, and the temperature of the entire firing chamber (inside the furnace) is accurate. Cannot be controlled. On the other hand, the indirect heating method is a method in which the entire firing chamber (inside the furnace) is heated rather than a method in which combustion gas or hot air is blown from one end of the cylinder as in the direct heating method. Temperature control becomes easy. Uniform temperature control is important for the following reasons.

[0073] The sludge contains ink components such as carbon black, organic substances such as fibers and polymers, and inorganic particles such as calcium carbonate, kaolin, and talc. In order to improve the whiteness of the sludge fired product, it is necessary to remove carbon black, which is a black ink component. In order to completely burn a single carbon black, it is necessary to have a combustion treatment time of at least 60 minutes at 600 ° C and 20 minutes at 850 ° C in an excess air atmosphere. It is better to make it higher. However, if the temperature is set too high, the inorganic particles in the sludge will change in sintering, and the fired sludge will become hard, which is preferable as a papermaking material!

[0074] Hardening of the inorganic particles by the high-temperature heat treatment is caused by a thermal alteration phenomenon of inorganic calcium carbonate and kaolin (clay), which are mainly contained in the following sludge. That is, calcium carbonate begins to be decarboxylated from above 600 ° C, and at least part of it begins to be decomposed into oxidizing power, and completely decomposes into calcium oxide at 900 ° C. Talc does not change its crystal structure up to 900 ° C. Titanium dioxide is stable at 1000 ° C and does not change at all. Kaolin is desorbed from around 400 ° C and exists as amorphous metakaolin from 500 to 850 ° C. This amorphous metakaolin, which is called calcined kaolin, is an inorganic particle that is bulky and has good opacity and excellent smoothness. When it exceeds 900 ° C, γ-alumina and mullite are produced. These γ-alumina and mullite are very Since it is hard, wire wear and coating blade wear will deteriorate, making it unfavorable as a papermaking material. Also, in the region slightly above 850 ° C, the presence of amorphous metakaolin and calcium oxide decomposed from the above-mentioned carbonic acid power, the hard, reusable oleite and gorenite can be formed by chemical reaction. Generate.

Therefore, it is preferable that the sludge temperature in the heat treatment step of the present invention does not exceed 850 ° C. at which a hard fired product is not formed. Also, if the maximum temperature is less than 600 ° C, it takes a very long processing time to improve the whiteness, and the heat treatment apparatus that increases not only the energy cost increases, but this is not preferable in practice. Accordingly, a preferable sludge temperature is preferably 600 ° C or higher and 850 ° C or lower, more preferably 600 ° C or higher and 800 ° C or lower. )

[0076] In the heat treatment step of the present invention, the sludge temperature may be increased stepwise to a temperature not exceeding 850 ° C!

[0077] After all, to prevent the fired sludge from becoming hard in this way, the sludge temperature at the time of firing is set lower, and the organic content in the sludge S is completely burned. Is difficult, and there is a possibility that some unburned matter represented by carbon black remains. The temperature shown here is the sludge temperature at the time of firing in the firing chamber 9, and is strictly different from the ambient temperature in the heat treatment apparatus. The temperature in the heat treatment apparatus is a force that depends on the temperature of the supplied air. Usually, it is lower than the sludge temperature.

[0078] In the heat treatment step of the present invention, the reason why the heat treatment apparatus is heat-treated in an excess air atmosphere, that is, in an oxygen-rich atmosphere is to efficiently burn organic substances contained in the sludge. The excess (rich) oxygen atmosphere here means that sufficient air (oxygen) necessary for combustion is applied to the organic matter to be combusted so that the residual oxygen concentration in the combustion exhaust gas is 5% or more. It is the state where the organic matter can be completely burned. It is also possible to adjust the sludge temperature according to the amount of air exhausted and the temperature of the intake air.

[0079] The amount of air sucked into the heat treatment apparatus is preferably greater than or equal to the theoretical oxygen amount necessary for burning organic components. However, since the combustion gas generated by burning organic components is larger than the amount of air equivalent to the theoretical oxygen amount, it is necessary to exhaust at least the generated combustion gas in order to achieve excess (rich) oxygenation. There is. Therefore, the amount of air to be sucked is controlled by adjusting the exhaust amount of the exhaust fan. This displacement is 1.1 times the theoretical air flow More preferably, it is 1.5 times or more, more preferably 2 times or more. However, if the amount of intake air is too large, the sludge temperature is lowered, which is not preferable in terms of energy cost. Further, the inhaled air may contain more carbon dioxide than usual. When the oxygen amount in the heat treatment apparatus is less than the theoretical oxygen amount, the oxygen is in an oxygen-deficient state, and the sludge is carbonized, leaving unburned carbon in the sludge. In order to remove this unburned carbon, it is necessary to increase the heat treatment temperature or to treat for a long time. In the end, it is difficult to obtain the desired sludge fired product. Therefore, it is absolutely necessary to avoid making the inside of the furnace hypoxic.

[0080] In the present invention, the force S that increases the whiteness of the sludge fired product by high-temperature treatment in order to burn the sludge S more completely in an excess (rich) oxygen atmosphere. As mentioned above, hard fired products are easily generated.

In the present invention, as shown in FIG. 2, the air supply port 3 is installed in the vicinity of the sludge discharge port 8, and the exhaust fan 4 that discharges the unburned matter conveying air stream A is installed in the vicinity of the sludge supply port 2. When installed in the heat treatment apparatus, it is possible to generate an unburned substance transfer air flow A in a direction opposite to the direction B in which the sludge S travels in the heat treatment apparatus.

[0082] In this invention, the method of generating the unburned matter conveying air flow A in the direction opposite to the traveling direction B of the sludge S is called a countercurrent method. This counter-current method allows the unburned product to be removed efficiently from the sludge fired product because the air flow for conveying the unburned product flows in the opposite direction to that sent to the sludge discharge port 8 side of the sludge fired product. It is preferable to improve the whiteness of the sludge burned product! In particular, unburned matter that is generated during combustion in the first stage of the heat treatment process is difficult to be completely burned until later, and can therefore be effectively removed by this counter-flow of unburned matter carrying air flow.

[0083] Therefore, in order to achieve higher whiteness, 100% complete combustion of unburned sludge is guaranteed, and 100% combustion is abandoned rather than setting the sludge temperature higher. The feature of the present invention is to obtain inorganic particles that have high whiteness and do not contain a high-hardness composite by overlooking the generation of a small amount of unburned matter and, rather, removing the unburned matter from the sludge burned product. There is. The above-mentioned unburned substances are unburned organic substances, most of which are Unburned carbon particles, in other words, carbide particles. In other words, it is a carbon black-like substance, and the carbon black has a size of 10 to 500 nm and a fine powder with a specific gravity of 1.8 to 1.9. In order to remove the unburned matter in the form of fine powder, the air in the furnace is exhausted by the exhaust fan 4 to generate an unburned matter transfer air flow A in the heat treatment apparatus, and the transfer air flow A is generated. The unburned material is taken out by placing it. In this way, it is very preferable to forcibly exhaust the unburned-substance-conveying air flow using an exhaust fan or the like. More preferably, air is forcibly introduced in addition to such forced exhaust.

[0084] The flow rate of the unburned product air flow by forced exhaust or the like is not particularly limited as long as it can remove the fine powdery unburned product, but if the flow rate is low, the air flow is supplied to the supply hopper 2. There is a concern that the unburned product cannot be removed well and mixed into the sludge fired product, resulting in a decrease in whiteness. The flow rate of the unburned matter conveying air stream carrying unburned matter containing carbon black having the above properties is preferably 0.4 m / min or more, more preferably 0.8 to 1.5 m / min. Above, particularly preferably 1.5 m / min or more. However, if the air flow velocity is too high, there is a greater risk of the sludge fired material entering the exhaust fan 4 side and thermal efficiency is also reduced. The flow rate of this air flow was theoretically determined from the measured values of the exhaust fan exhaust air temperature, air temperature, etc., and the temperature in the heat treatment equipment.

[0085] On the other hand, FIG. 3 shows an example of an air inflow method opposite to the other method of the counter flow method. FIG. 3 is a configuration diagram of another example of a heat treatment apparatus using an indirectly heated rotary kiln used in the heat treatment process of the present invention. In FIG. 3, members denoted by the same reference numerals as those in FIG. 2 are the same as those described in FIG. In the heat treatment apparatus of FIG. 3, the exhaust fan 4 is installed in the vicinity of the sludge discharge port 8! Therefore, the unburnt material carrying air flow A ′ and the sludge traveling direction B ′ are in the same direction. Such a method is called a parallel flow method in the present invention. In this parallel flow method, there is a concern that the unburned product is likely to be mixed into the sludge burned product because the outlet for separating and removing the sludge burned product and the unburned product is in the same direction. Further, in the parallel flow method, the counter-flow method is more preferable because the unburned product is easily mixed into the sludge fired product even if the flow rate of the unburned product transport air flow is adjusted as described above. [0086] Also, in the present invention, when the sludge combustion temperature in the heat treatment apparatus becomes high, the air inflow amount is increased beyond a certain level so that excess sludge combustion heat is removed from the heat treatment apparatus by the air flow. The combustion temperature of the sludge S in the firing chamber 9 is reduced by discharging the high-temperature combustion exhaust gas in the firing chamber 9 of the rotary kiln 1 to the outside of the rotary kiln 1 by the exhaust fan 4 on the sludge supply side. Can do. Therefore, in this heat treatment apparatus, contrary to the above, even if the temperature is high! /, Even if it is, the sludge combustion heat is discharged outside the heat treatment apparatus by increasing the air inflow amount above a certain amount, that is, the rotary kiln. The temperature S can be reduced by discharging heat from the main body cylinder part to the outside of the sludge supply side together with the air flow. In other words, it is possible to control to avoid a rise above the set heat treatment temperature. Therefore, the air flow A for transporting unburned matter mentioned above also serves as an air flow for exhausting sludge combustion heat. In this respect as well, the counterflow method has an exhaust port near the sludge supply port that discharges the airflow, so the sludge combustion heat that does not pass through the heat treatment device is heat-treated as compared to the parallel-flow method. It is more preferable because it can be discharged outside the device and the sludge temperature can be easily controlled.

[0087] In addition to the above, there is a method for controlling the sludge combustion temperature. If the sludge combustion temperature is low while there is a sufficient amount of raw material sludge for combustion, a large amount of air is introduced to perform combustion. This is not preferable because the force S that can raise the temperature with S and a large amount of combustion heat are generated, making it difficult to control the temperature. On the other hand, when the sludge combustion temperature is high, the ability to suppress (carbonize) combustion by restricting the air inflow and control the temperature In the present invention, heat treatment is performed for the purpose of firing the sludge with high whiteness. Since it is necessary to bring the inside of the device to an oxygen-rich state and to sufficiently burn sludge, it is not preferable to restrict the air inflow more than necessary.

[0088] In addition, the difference in the characteristics of the counter-flow type and the parallel-flow type air inflow methods is prominent in a rotary horizontal cylindrical furnace and a screw-type horizontal cylindrical furnace. On the other hand, in a vertical cylindrical furnace, it is difficult to make a difference because air needs to flow to improve the contact between air and sludge, but the parallel flow method is slightly more effective than the countercurrent method. is there.

[0089] The unburned matter taken out by separation on the unburned matter carrying air stream A is separated from the hot air circulation fan. More preferably, it is removed by a bag filter provided subsequent to the tank 6 and / or collected and removed by combustion with exhaust gas (both not shown).

[0090] Heat treatment equipment power The discharged hot air can be reused as a heat source for heat treatment equipment or a dryer by the heat circulation fan 6 to reduce energy costs.

Yes

[0091] The time during which the sludge is heated to a constant temperature (heat treatment time) is not particularly limited, but the organic matter remaining in the firing chamber 9 is completely burned without being blown away by the air flow A for conveying the unburned air current. 1 hour or more is preferable because it is necessary to keep the time to perform. However, an unnecessarily long heat treatment time is not preferable in practice because it increases not only the energy cost but also the heat treatment apparatus. Therefore, the heat treatment time in the heat treatment step of the present invention is more preferably 1 to 5 hours. By appropriately controlling the conditions such as heat treatment time, sludge temperature, air flow rate, flow rate, etc., the decomposition rate of calcium carbonate is preferably 50% or more, more preferably 60% or more, and even more preferably 70%. ing.

[0092] [Baking product suspension process]

In the present invention, as illustrated in FIG. 1, the fired product after the heat treatment step may be provided with a suspension step after the heat treatment step, in which the fired product is mixed with water and stirred to form a suspension of the fired product. . The purpose of the suspension process is to convert calcium oxide (CaO) contained in the sludge calcined product into calcium hydroxide [Ca (OH)], and the suspension temperature of the calcined product is not particularly limited.

2

Yes. Low processing temperature requires a long holding time, and high processing temperature is not economically preferable because it is necessary to maintain the temperature, so usually 20 to 80 ° C, more preferably 40 to 60 ° C. It is good to be done. For example, if the processing temperature is 60 ° C, a holding time of about 60 minutes is sufficient.

[0093] The solid content concentration of the baked product suspension can be adjusted to a range of 5 to 20% by mass, so that the subsequent carbonation treatment can be performed efficiently! It is preferable in order to maintain good stirring properties and liquid feeding properties. When the solid content concentration of the baked product suspension is less than 5% by mass, the productivity is inferior because it is inferior, and when it is higher than 20% by mass, the viscosity of the baked product suspension becomes high. This is not preferable because the stirring power increases and the operability is poor. [0094] In addition to the sludge calcined product of the present invention, calcium oxide (CaO: quick lime) or calcium hydroxide [Ca (OH): slaked lime] is separately added to the calcined product suspension as necessary. Attendant

2

It can also be made into a mixed suspension of a sludge calcined product and calcium hydroxide at a predetermined solid content concentration. In this case, calcium oxide and calcium hydroxide are calcium hydroxide [Ca (Ca ( OH): slaked lime], for 100 parts by weight of the sludge burned product

2

It is possible to add up to 100 parts by weight (sludge: calcium hydroxide = 50: 50). The ability to add calcium hydroxide in excess of 100 parts by weight This is not preferable because the ratio of the sludge burned product in the slaked suspension is reduced and sludge use does not proceed.

[0095] [Carbonation step]

Sludge containing calcium carbonate is subjected to a heat treatment process of 600 ° C or higher, and calcium carbonate (CaCO) is decomposed into calcium oxide (CaO). Calcium oxide was present

Three

If the calcined ash is made into an aqueous suspension, it becomes highly alkaline, and there are problems such as an increase in slurry viscosity and poor dispersion. Therefore, it is difficult to use it as it is as a paper filler or coating pigment. When the sludge combustion efficiency is improved as in the heat treatment step of the present invention, decomposition of calcium carbonate is promoted. In other words, the whiteness of the calcined ash after the heat treatment step of the present invention and the decomposition rate of calcium carbonate are in a proportional relationship, and in order to obtain the desired white calcined ash, the calcium carbonate in the sludge is decomposed by more than 50%. ing. In order to obtain high white calcined ash, 60% or more is decomposed, and in order to obtain high whiteness calcined ash, 70% or more is decomposed. Therefore, it is preferable to neutralize the aluminum component by some method such as carbonation treatment or aluminum sulfate mixing treatment on the heat-treated sludge calcination ash.

[0096] In the present invention, by performing the carbonation step after the suspension of the calcined product, calcium hydroxide [Ca (OH)] in the suspension of the calcined product is regenerated to calcium carbonate (CaCO).

2 3 Can be converted to lower the pH of the regenerated inorganic particle slurry. By setting the pH of the regenerated inorganic particle slurry to 11 or less, preferably 10 or less, it is possible to suppress an increase in slurry viscosity and to prevent poor pigment dispersion.

[0097] When the calcium carbonate is not contained in the sludge, the calcium carbonate is not decomposed to become calcium oxide, so that the calcined ash can be dispersed at a high concentration, and a calcined product suspension after the heat treatment step is obtained. Process and carbonation process without using it as a papermaking material. It can be reused as it is.

[0098] The carbonation step can be carried out in the same manner as the ordinary light calcium carbonate production step. That is, carbon dioxide gas or carbon dioxide-containing gas is blown into the fired product suspension. The gas used for carbonation is preferably a carbon dioxide-containing gas industrially. The carbon dioxide concentration in this case is not particularly limited, but is preferably 5 to 40% by volume, more preferably 10 to 35%. A volume% carbon dioxide containing gas is used. The carbon dioxide-containing gas is, for example, discharged from sludge calcined exhaust gas, limestone calcined exhaust gas, lime calcined exhaust gas, waste incineration exhaust gas, power generation boiler exhaust gas, or a caustic calcium carbonate calcined kiln used in pulp manufacturing processes. The exhaust gas may be used after dust removal by appropriate means.

[0099] The carbon dioxide gas or carbon dioxide-containing gas is blown into the calcined suspension so that the carbon dioxide gas has a rate of 0.5 to 15 L / min per kg of calcium hydroxide as carbon dioxide gas. If the amount of carbon dioxide introduced is less than 0.5 L / min, the productivity will be inferior, and it will be possible to adopt an amount exceeding 15 L / min, and the power load necessary to increase the usage will be commensurate with this. The effect cannot be expected. The reaction start temperature for carbonation is preferably 30 to 80 ° C, more preferably 40 to 70 ° C. The shape of the regenerated calcium carbonate component contained in the regenerated inorganic particles can be in the form of rice, spindle, colloid, needle, cube, plate, etc. The shape is not particularly limited. Add seed crystals to obtain crystals of the desired shape.

[0100] It should be noted that the inorganic particles after the carbonation treatment of the present invention are particles suitable for a paper-making filler because fine primary particles produced by the carbonation treatment aggregate to form secondary particles (aggregated particles). It may be a diameter. In such a case, this suspension can be used as it is by mixing it with papermaking raw materials such as pulp as a papermaking filler.

[0101] When the recycled inorganic particle slurry (slurry after carbonation) of the present invention is used as a filler for papermaking, it may be filtered through a sieve such as a vibrating sieve. At this time, it is preferable to perform classification using a liquid cyclone before filtering with a sieve. By performing classification with a hydrocyclone, clogging of the sieve can be prevented. In addition, particles containing silicon such as α-quartz in the recycled inorganic particle slurry can be obtained by combining classification with a hydrocyclone and a vibrating sieve. And coarse particles can be removed, and wear of the papermaking wire can be reduced.

[0102] [Dehydration and dispersion process]

When the regenerated inorganic particle slurry (slurry after carbonation) of the present invention is used as a coating pigment, a dehydration step of dehydrating the composition regenerated inorganic particle slurry after the carbonation step into a dehydrated composition; And a dispersion step of adding water to the dehydrated composition obtained by the dehydration step to form a slurry-like dispersion composition. The dehydration step can be performed by operations such as filtration, centrifugation, pressure dehydration, and pressing. As a suitable dehydrating apparatus, there is a press filtration apparatus called a filter press, which can obtain a dehydrated cake of a carbonized product. The dispersion process may be any process as long as water is added to the dehydrated composition obtained by the dehydration process to form a slurry dispersion composition. It is preferable to add a dispersing agent in addition to moisture during the dispersing step, because it is possible to satisfactorily disperse the regenerated inorganic particles using sludge as a raw material, improving the quality as a papermaking material and facilitating handling. As the dispersant, for example, general dispersants used in the manufacture of papermaking materials such as synthetic polymer dispersants such as sodium polyacrylate can be used.

[0103] [Crushing process]

In the present invention, the pulverization step may be provided after the dispersion step. By performing the pulverization treatment, it is preferable because the regenerated inorganic particles can be made finer in particle size and smoothness is improved. As a pulverizer used in the pulverization process, it is possible to use a wet pulverizer such as a sand mill, a wet ball mill, a vibration mill, a stirring tank mill, a flow tube mill, and a coball mill. Moreover, you may grind | pulverize, blowing in a carbon dioxide.

[0104] The size (particle diameter) of the regenerated inorganic particles of the present invention is preferably an average particle diameter measured by laser diffraction particle size distribution of finally 0. When used as a pigment, it is particularly preferably from 0 · 3 to 5 111, and when used as a paper filler for internal addition, 3 to 15 m.

[0105] This average particle size is excellent in opacity, whiteness, smoothness, and printability when finished as a paper product as a paper filler and coating pigment. Therefore, the particle size is selected so as to balance the operation and quality. Therefore, by setting the average particle size of the regenerated inorganic particles within the range of the particle size, the operation is performed. Can be handled in the same way as conventional paper fillers and coating pigments, and the quality of coated paper coated with recycled inorganic particles and coated paper coated with recycled inorganic particles It can exert the same quality as conventional paper fillers and coating pigments.

[0106] Incidentally, when the average particle size of regenerated inorganic particles is less than 0.1 m, it is effective for improving opacity, whiteness and smoothness, but for papermaking. When used as a filler, the wire yield deteriorates, so a large amount of filler is required, which makes the operability unstable.In addition, sufficient coating layer strength when used as a coating pigment This is not preferable because it requires a remarkably large amount of adhesive in order to develop the above. On the other hand, when the average particle size of the recycled inorganic particles exceeds 20 in, the wire yield of the filler is improved when used as a paper filler, but on the other hand, the wire wear resistance deteriorates and the wire is damaged. In addition to the disadvantages of being easily affected, when used as a coating pigment, the smoothness and gloss of the coated paper product decrease, resulting in a decrease in printability, which is not preferable.

[0107] In the present invention, it is preferable to provide a dispersion step and a pulverization step after the dehydration step so that the regenerated inorganic particles have the desired particle size described above. However, the average particle size of the regenerated inorganic particles after the dispersion treatment is If the particle diameter is in the above range, the pulverization step is not performed. Naturally, the dispersion of the inorganic particles after the dispersion treatment may be used as it is as a paper filler and a coating pigment.

[0108] Also, in the dispersion step, the dehydrated composition of regenerated inorganic particles of the present invention is mixed with calcium carbonate slurry to form a mixed slurry, which is pulverized using a wet pulverizer, so that the quality is higher than that of calcium carbonate. In addition, the pulverization time can be made shorter than that of the calcium carbonate slurry, and a highly concentrated slurry can be prepared. The ratio between the regenerated inorganic particles and calcium carbonate can be adjusted according to the quality of the white paper of the coated paper, and is not particularly limited.

[0109] Although the heat treatment step is essential for the steps in this method, the drying step, granulation step, suspension step, carbonation step, dehydration / dispersion step, and pulverization step can be appropriately selected and combined. S can. A single plant is constructed by combining the devices that perform these processes. Will be.

[0110] The inorganic particles obtained by this method are mixed with inorganic pigments such as calcium carbonate, talc, kaolin, calcined kaolin, titanium dioxide, satin white, silica, etc. as necessary, and are used as coating pigments or papermaking fillers. Can be used as

[0111] [Method for producing paper internally containing inorganic particles from sludge]

Paper using the regenerated inorganic particles obtained by this method as a filler can impart opacity and bulkiness, and can be paper that internally contains the regenerated inorganic particles of the present invention as with conventional fillers. There is no particular limitation. Paper types include wrapping paper, paper containers, inkjet paper, recording paper such as PPC paper, newsprint paper, high-quality paper, medium-quality paper, and various types of coating paper.

Wallpaper, fiberboard, photographic base paper, impregnating base paper, flame retardant paper, and the like.

[0112] Examples of pulp include commonly used bleaching chemical pulps such as LBKP and NBKP, groundwood pulp (GP), pressurized groundwood pulp (PGW), refined groundwood pulp (RGP), and thermomechanical pulp (TMP). ) Etc., deinked waste paper pulp (DIP), waste paper, etc. are used as appropriate. In addition, one or more of pulp fiber, synthetic pulp, inorganic fiber and the like obtained from non-wood fiber raw materials such as kenaf can be blended in the base paper. Mechanical pulp and DIP can be used after being bleached if necessary, and the degree of bleaching can be performed arbitrarily. For bleaching pulp, a bleaching process that does not use molecular chlorine such as chlorine gas or chlorine compounds such as chlorine dioxide is preferable from the viewpoint of environmental conservation. Examples of the processed pulp include ECF (Elemental Chlorine Free) pulp and TCF (Totally Chlorine Free) pulp.

[0113] Regenerated inorganic particles obtained by this method are used as fillers generally used, for example, heavy calcium carbonate, light calcium carbonate, calcium sulfite, gypsum, talc, kaolin, clay, calcined kaolin, white Carbon, amorphous silica, delaminated kaolin, diatomaceous earth, magnesium carbonate, titanium dioxide, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide and other inorganic pigments, urea formalin resin fine particles, fine hollow particles, etc. It can also be used as a mixture with other organic pigments. Two or more fillers can be used in combination. The mixing ratio can be adjusted according to the paper quality and is not particularly limited. It is preferable to add so that the filler content (base paper ash) is in the range of! ~ 30% by weight. It is particularly preferable to add so as to be in the range of 5 to 20%. By making the internal content paper of inorganic particles into the filler content, it is possible to increase the scattering surface area of the paper and increase the opacity of the paper. Incidentally, when the filler content is less than 1% by weight, the paper quality such as the target opacity is lowered, which is not preferable. On the other hand, when the filler content exceeds 30% by weight, the tear strength is increased. Further, it is not preferable because the paper interlaminar strength and the paper quality of blisters and the like deteriorate.

[0114] When the recycled inorganic particles of the present invention are used as a filler for papermaking in combination with various fillers, considering the effects of cost and the like, the amount of filler added to the base paper is less than 100% by weight. The addition of at least 10% by weight is preferred, but is not particularly limited.

[0115] In addition to pulp and filler, the paper contains an internal sizing agent, anionic, nonionic, cationic or amphoteric retention improver, drainage improver, paper strength enhancer, sizing agent, Various internal additives for papermaking exemplified by antifoaming agents, slime control agents, dyes, coloring pigments, fluorescent dyes and the like can be added as necessary. Specific examples of the internally added sizing agent include alkyl ketene dimer, alkenyl succinic anhydride, styrene acrylate, higher fatty acid, petroleum resin sizing agent, rosin sizing agent and the like. Specific examples of yield improvers, drainage improvers, and paper strength enhancers include, for example, polyvalent metal compounds such as aluminum (specifically, sulfate bands, aluminum chloride, sodium aluminate, basic Aluminum compounds, etc.), various starches, polyacrylamides, urea resins, polyamide amide polyamine resins, polyethyleneimine, polyamines, polybutyl alcohol, polyethylene oxide and the like.

[0116] Regenerated inorganic particles that have not been carbonated may interfere with the effect of the internal additive sizing agent due to the influence of free Ca ions, or may generate calcium sulfate due to reaction with the sulfuric acid band in the papermaking process. This may cause scale problems and decrease the filler yield, which may affect operability and productivity. Therefore, in order to avoid these problems, it is preferable to use carbonated regenerated inorganic particles.

[0117] When adding the papermaking filler containing the regenerated inorganic particles in the present invention to the pulp raw material, it is preferable to add the papermaking filler while sufficiently stirring the pulp raw material. Is preferably about 100 to 5000 rpm. Also, for pulp raw materials When adding the paper filler containing recycled inorganic particles, the paper filler is added after mixing the pulp raw materials, so it is added at a concentration that falls within the inlet concentration range of the paper machine. If there is no problem. In addition, as a suitable point (addition location) in the process of adding a paper filler containing recycled inorganic particles to a pulp raw material, recycled inorganic particles formed by aggregation by adding a yield improver such as a cationic polymer In order to prevent the flocs of the paper-made filler containing the material from being broken by shearing force, etc., and to add the paper-made filler to the paper while maintaining the agglomerated state, it is desirable to be as close as possible to the paper machine.

[0118] Papermaking conditions are not particularly limited. Examples of papermaking machines include commercial-scale paper machines such as long net paper machines, gap former paper machines, circular net paper machines, and short net paper machines. It can be used by appropriately selecting according to the purpose. As the papermaking method, acidic papermaking, neutral papermaking, weak alkaline papermaking, etc. can be used. It is also possible to perform size treatment on paper using various size presses and roll coaters with natural adhesives such as starch, and synthetic adhesives such as polybulal alcohol.

[0119] Further, the surface of the papermaking filler-added paper containing the regenerated inorganic particles in the present invention has various types of dampening generally used for improving and improving paper strength, coating suitability, printing suitability, and the like. It is also possible to apply a coating liquid mainly composed of sucrose, polybulal alcohols, polyacrylamides, and various surface sizing agents. For the surface coating solution, various pigments commonly used for coating include heavy calcium carbonate, light calcium carbonate, talc, clay, kaolin, titanium dioxide, synthetic silica, aluminum hydroxide, etc. Of organic pigments and synthetic polymer fine particles such as polystyrene resin and urea formaldehyde resin, etc. as needed It can also be applied to the surface of paper.

[0120] [Production of coated paper using inorganic particles from sludge as pigment]

It can be produced by forming one or more coating layers mainly composed of a pigment containing regenerated inorganic particles obtained by this method and an adhesive on at least one side of a base paper. When used as a pigment, the regenerated inorganic particles obtained by this method have excellent properties such as smoothness, covering properties, opacity, and ink setting properties. In order to exhibit these effects, all the regenerated inorganic particles in the coating layer are used. It is preferable to contain 5% by mass or more of the pigment. If it is less than 5% by mass, smoothness and coverage It is difficult to impart an effect of improving opacity and ink setting. In particular, by bringing the coated layer containing the regenerated inorganic particles obtained by this method into contact with the base paper, it is possible to improve the smoothness, coverage, opacity, and ink setting properties, which is preferable. . Further, the average particle size of the regenerated inorganic particles by laser diffraction scattering method is preferably from 0.3 to 5 111, and more preferably 2.5 m or less from the viewpoint of smoothness.

[0121] In the present invention, other than the regenerated inorganic particles obtained by the present method contained in the coating layer, heavy calcium carbonate, light calcium carbonate, talc, calcium sulfate, barium sulfate, hydroxide Aluminum, titanium dioxide, zinc oxide, alumina, magnesium carbonate, magnesium oxide, silica, alumina magnesium silicate, calcium silicate, bentonite, zeolite, sericite, sukumite and other inorganic pigments, solid, hollow, and penetrating It is possible to use pigments used in the ordinary coated paper field, such as organic pigments such as porous plastic pigments and binder pigments, and one or more of these can be selected as appropriate. Can be used in combination.

[0122] A dispersion-type adhesive is usually used for the adhesive component of the coating layer containing the pigment as described above. Examples of the dispersion-type adhesive include conjugated-gen polymer latex such as styrene-butadiene copolymer and methyl methacrylate-butadiene copolymer, acrylic polymer latex, and ethylene-based butyl copolymer. Illustrate coalesced latex etc. Use force S.

[0123] A small amount of a water-soluble adhesive can be used in combination with the above dispersion-type adhesive. Examples of water-soluble adhesives include various starches such as oxidized starch, esterified starch, and cold-water soluble starch, proteins such as casein, soy protein, and synthetic protein, cellulose derivatives such as carboxymethylcellulose and methylcellulose, polybuty alcohol, Examples of such modified products can be given.

[0124] For coating pigments containing regenerated inorganic particles, it is preferable that the total amount of adhesive is 5 to 50 parts by mass per 100 parts by mass of pigment. 8 to 30 parts by mass It is particularly preferable to contain so that If the amount of the adhesive is less than 5 parts by weight per 100 parts by weight of the pigment, the strength of the pigment coating layer decreases, causing problems such as streaks, scratches, and picking. The amount is 100 parts by mass of pigment. When the amount exceeds 50 parts by mass, the strength of the pigment coating layer is sufficiently exhibited, but problems such as a decrease in smoothness and a deterioration in ink drying property are not preferable.

[0125] In the coated layer of the coated paper of the present invention, a blue or purple dye or colored pigment, a fluorescent whitening dye, a thickening agent, a water retention agent, an antioxidant, an anti-aging agent may be used as necessary. Various auxiliary agents such as an agent, a conductive inducer, an antifoaming agent, an ultraviolet absorber, a dispersant, a pH adjuster, a mold release agent, a water-resistant agent, and a water-repellent agent can be appropriately blended. Regenerated inorganic particles that have not been carbonized have problems such as an increase in viscosity of the coating solution and poor dispersion due to the influence of free Ca ions, making it impossible to prepare a high concentration coating solution and drying. It can cause defects and affect operability and productivity. In addition, coated paper with a high pH on the paper may cause alkali burnt during the calendering process and storage, which may impair the appearance of the coated paper. Therefore, in order to avoid these problems, it is preferable to use carbonated regenerated inorganic particles.

[0126] Whether the coating layer provided on the base paper is a single layer or a multilayer of two or more layers is not particularly limited, it is not necessary for all to be the same. It is possible to adjust accordingly. In addition, the coating amount of the coating layer can be adjusted according to the blank paper quality, printing quality, etc. of the coated paper, which is not particularly limited, but in general, 5 to 40 g / m per side It is about ² .

[0127] Regarding the coating method in providing the coating layer in the present invention, various coating apparatuses used in the ordinary coated paper production field, such as an air knife coater and various blade coaters. Ronore coater, Ronore coater. Thai coater, curtain coater, etc. can be used as appropriate.

[0128] For the base paper in the present invention, particularly the basis weight of Nag in the limited base paper, one general, it is possible to use those appropriately adjusted in the range of about 30 to 500 g / m ^2.

[0129] The coated paper obtained in this manner may be subjected to product finishing by passing it through various known and publicly used finishing devices such as a super strength renderer, a dalos calender, a soft calender, a mat calender and the like.

[0130] Further, a base paper using recycled inorganic particles made from sludge as a raw material and a coating layer containing recycled inorganic particles made from sludge as a raw material may be combined to form a coated paper.

[0131] [Examples and comparative examples] EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited thereto. Unless otherwise specified, parts and percentages in the examples refer to parts by mass and mass%, respectively. Further, pH and X-ray diffraction measurements in Examples and Comparative Examples were measured by the following methods.

[0132] [Measurement of X-ray diffraction]

The sample was coarsely crushed with a mortar until the particles disappeared, and measured using an X-ray diffractometer (M03XHF, manufactured by Mac Science Co., Ltd.) at measurement conditions of 40 KV, 20 mA, and measurement range: 5 to 50 degrees. The details were as follows.

[Calcium carbonate decomposition rate after combustion treatment]

Next, as an evaluation other than the items listed in Table 1, for each example, the decomposition rate of calcium carbonate after heat treatment was determined in the following steps i) to vi). The amount of residual calcium carbonate in the fired product was determined and evaluated.

[0133] i) Preparation of calcite calcium carbonate calibration curve

Calcium carbonate with a crystal structure of calcite (Tamapearl 222H manufactured by Okutama Kogyo Co., Ltd.), zinc oxide (special grade reagent manufactured by Kishida Chemical Co., Ltd.) as an internal standard substance, weight ratio of 1: 5, 1: 1, 5: 1 Each was mixed. Next, after each mixture is sufficiently ground using a mortar, it is used with an X-ray diffractometer (M03XHF described by Max Science Co., Ltd.) under the conditions of 40 KV, 20 mA, and a diffraction angle measurement range of 5 to 50 degrees. A calibration curve of force-calcite calcium carbonate was prepared based on the X-ray diffraction 100% peak areas of calcite calcium carbonate and zinc oxide.

[0134] ii) Preparation of calibration curve for aragonite calcium carbonate

A calibration curve for aragonite calcium carbonate was prepared in the same manner as the calibration curve for calcite calcium carbonate, except that calcium carbonate with a crystal structure of aragonite (Tama Pearl 123 manufactured by Okutama Kogyo Co., Ltd.) was used.

[0135] iii) Determination of calcium carbonate in paper sludge before combustion treatment

A weighed zinc oxide (special grade reagent described above) was added and mixed to the weighed absolute dry paper sludge. Next, the mixture was sufficiently ground using a mortar and then X-ray diffractometer (M03XHF described above) was used to measure 40KV, 20mA, diffraction angle measurement range 5 Determine the X-ray diffraction 100% peak area of calcium calcite carbonate and aragonite calcium carbonate with respect to zinc oxide based on the condition of ~ 50 degrees, and based on the calibration curve of each calcium carbonate described above, in the papermaking sludge lg Calculated the amount of calcium carbonate (g)

Yes

[0136] iv) Measurement of ash content in paper sludge

The weighed absolute dry paper sludge was burned in a pine furnace at 350 ° C for 30 minutes, the weight of the resulting sludge fired product was weighed, and the ash content (%) of the sludge was measured by the following formula .

Ash content (%) = (Weight of sludge baked product / Weight of paper drying sludge) X 100

[0137] V) Quantification of calcium carbonate in the sludge

The weighed sludge burned product was added and mixed with a weighed zinc oxide (special grade reagent mentioned above). Next, the mixture was sufficiently ground using a mortar, and then measured using an X-ray diffraction apparatus (M03XHF described above) under the conditions of 40 KV, 20 mA, and a diffraction angle measurement range of 5 to 50 degrees. Calcium calcite and aragonite carbonate power against zinc oxide X-ray diffraction 100% peak area of Lucium was calculated, and based on the calibration curve of each calcium carbonate described above, the amount of calcium carbonate contained in lg of sludge calcined product (g) Was calculated.

[0138] vi) Decomposition rate of calcium carbonate after combustion treatment

The amount of calcium carbonate (g) in the sludge fired product lg is A, the amount of calcium carbonate (g) in the paper sludge lg is B, and the ash content (%) is C. The rate of decomposition was calculated.

Calcium carbonate decomposition rate (%) = 100— [AX (C / 100)] ÷ B X 100

[0139] [Presence / absence of unregenerated calcium carbonate]

Using the X-ray diffractometer (M03XHF already described), the inorganic particle sample obtained by grinding the inorganic particles! /, Coarse in a mortar! /, And ground until no particles are present, is 40KV, 20mA, diffraction angle. The measurement range was 5 to 50 degrees, and the presence or absence of calcium oxide and calcium hydroxide as unregenerated calcium carbonate was examined.

[0140] [Measurement of average particle size]

Measured using Nikkiso Co., Ltd. Microtrac particle size distribution analyzer HRAX-100 did.

[0141] Example 1

[Sludge]

Flocculant is added to the foamy deinking flotation waste liquid that has been floated and separated from the wastepaper pulp by the floating sorting method (floatation method) in the wastepaper deinking process, which is mainly used for magazine wastepaper at a paper mill with wastepaper processing equipment. After the solid content in the waste liquid was agglomerated, it was sequentially passed through a rotary screen and a screw press to recover papermaking sludge (deinking sludge) having a solid content of about 50%. The ash content in this paper sludge was 60%, and its composition was calcium carbonate 55%, kaolin 45%, and talc 5%.

[0142] Processing steps]

This heat treatment step was performed by a heat treatment apparatus (cocurrent flow method) having the configuration shown in FIG. Specifically, a continuous externally heated rotary kiln 1 (IRK-02, manufactured by Kurimoto Iron Works, heated part: Φ 25 La X I 80 cm) was used as a heat treatment apparatus. Paper sludge S was supplied at a rate of 3.5 kg / h from supply hopper 2, which is a sludge supply port. The sludge is conveyed into the rotary kiln 1 by a screw feeder 10 with a diameter of about 35 mm. While passing through the rotary kiln 1, the sludge S is heat-treated, that is, burned. As the indirect heating means 5, a combustion gas from a combustion boiler (not shown) is supplied from a circulation blower 7 and used. At this time, the gas in the kiln is discharged from the exhaust fan 4 as an unburned matter transport air flow A 'at 100 L / min (20 ° C conversion), and the sludge temperature is 850 ° by controlling the air flow rate and indirect heating. The mixture was heated to C and allowed to stay in the heated part for 50 minutes (kiln tilt: 2%, rotation speed: 1.2 rpm) to prepare a fired product.

[0143] The obtained calcined sludge was measured by X-ray diffraction to determine the decomposition rate of calcium carbonate.

As a result, 100% of calcium carbonate was decomposed into calcium oxide. Kaolin was converted to 100% calcined kaolin, and talc was not decomposed at all. Part of unburned material was found in the burned sludge.

[0144] [Baking suspension process]

The obtained sludge calcined product was mixed with 60 ° C warm water in a suspension tank (dissolving tank), stirred for 60 minutes while maintaining the suspension tank at 60 ° C, and 12% calcined product suspension Was prepared. [0145] [Carbonation process]

Put 10kg of 12% calcined suspension at 60 ° C into the carbonation reactor, blow in with 20L / min of gas containing 25% carbon dioxide while maintaining the reactor at 60 ° C, and stir for 60 minutes. And regenerated inorganic particles were obtained. When the obtained regenerated inorganic particles were measured by X-ray diffraction, the calcium carbonate decomposed by the calcination treatment was regenerated into calcium carbonate. The regenerated inorganic particles obtained by the carbonation process were used as they were as paper fillers. The coating pigment was used after performing the following steps.

[0146] [Dehydration and dispersion process]

The composition after completion of the carbonation step was dehydrated with a filter press to obtain a dehydrated composition having a solid content of about 50%, and then the dehydrated composition was dispersed in water with a Coreless mixer so that the solid content was 48%. At the time of dispersion, a polyacrylic acid type dispersant (trade name: ALON T-50, manufactured by Toa Gosei Co., Ltd.) is added to water in an amount of 1.0 part relative to the solid content of the composition (the dehydrated composition). And a slurry was prepared.

[0147] [Crushing process]

The slurry composition after the dispersion step was pulverized using a sand grinder that is a wet pulverizer until the average particle size became 1.3 m.

[0148] Example 2

It carried out like Example 1 except having added the following drying processes before the heat treatment process.

[0149] [Drying process]

Paper sludge was dried using a rotary dryer to a solid content of 75%, and used as a raw material for the heat treatment process.

[0150] As a result of obtaining the decomposition rate of calcium carbonate in the obtained fired product, calcium carbonate was found to be 100

% Was broken down into calcium oxide. Kaolin was transformed into 100% calcined kaolin, and talc was not decomposed at all. Part of the unburned material was found mixed in the resulting sludge burned product.

[0151] Example 3

The following drying step was added before the heat treatment step, and the same heat treatment step was applied as in Example 1 except that the heat treatment step was changed. [0152] [Drying process]

[0153] Treatment process]

This heat treatment step was performed by a heat treatment apparatus having the configuration shown in FIG. Specifically, continuous external heating rotary kiln 1 ( _{IRK 02} manufactured by Kurimoto Iron Works, heated part: _φ25

X I 80 cm) was used as the heat treatment apparatus. Paper sludge S was supplied at a rate of 3.5 kg / h from supply hopper 2, which is a sludge supply port. Sludge S is conveyed into the rotary kiln 1 by a screw feeder 10. While passing through the rotary kiln 1, the sludge S is heat-treated, that is, burned. As the indirect heating means 5, combustion gas from a combustion boiler (not shown) was supplied from a circulation blower 7 and used. At this time, the gas in the kiln is discharged from the exhaust fan 4 at 250 L / min (converted to 20 ° C) as the air flow A for unburned material transfer, and the sludge temperature is 850 ° by controlling the air flow rate and indirect heating. The mixture was heated to C and stayed in the heated part for 50 minutes (kiln inclination: 2%, rotation speed: 1.2 rpm) to prepare a sintered product.

[0154] The obtained sludge fired product was measured by X-ray diffraction to determine the decomposition rate of calcium carbonate.

As a result, 100% of calcium carbonate was decomposed into calcium oxide. Kaolin was converted to 100% calcined kaolin, and talc was not decomposed at all. The burned sludge obtained did not contain any unburned material. The force with which no unburned matter was mixed was the same as in Examples 4 to 11 below.

[0155] Example 4

The same procedure as in Example 3 was performed except that the temperature of the heat treatment step was changed to 700 ° C. The obtained incinerated product was measured by X-ray diffraction to determine the decomposition rate of calcium carbonate. As a result, 35% of calcium carbonate was decomposed into calcium oxide. Also, 100% of kaolin was converted to calcined kaolin, and talc was not decomposed at all.

[0156] Example 5

The same procedure as in Example 4 was performed except that the heating time in the heat treatment step was changed to 90 minutes. The obtained incinerated product was measured by X-ray diffraction to determine the decomposition rate of calcium carbonate. As a result, charcoal 70% of the calcium acid was broken down into calcium oxide. Also, 100% of kaolin was converted to calcined kaolin, and talc was not decomposed at all.

[0157] Example 6

This was carried out in the same manner as in Example 5 except that the sludge size was changed to lmm in diameter. The obtained incinerated product was measured by X-ray diffraction to determine the decomposition rate of calcium carbonate. As a result, 70% of calcium carbonate was decomposed into calcium oxide. Also, 100% of kaolin was converted to calcined kaolin, and talc was not decomposed at all.

[0158] Example 7

This was performed in the same manner as in Example 6 except that the sludge size was changed to 20 mm in diameter and the air flow A for conveying unburned matter was 500 L / min. The resulting incinerated product was measured by X-ray diffraction to determine the decomposition rate of calcium carbonate. As a result, 100% of calcium carbonate was decomposed into calcium oxide. In addition, 100% of kaolin was transformed into calcined kaolin, and talc was not decomposed at all.

[0159] Example 8

The following granulation step was added before the drying step, and fi was conducted in the same manner as in Example 7 except that the heat treatment step was changed.

[0160] [Granulation process]

Sludge, using a briquette machine, Φ 20πιιη

X was formed to 5 mm and used as a raw material for the drying process and heat treatment process.

[0161] Processing steps]

The granulated paper sludge supply rate is 3.5 kg / h, the unburned material transport air flow A is 300 L / min, and the sludge temperature is heated to 600 ° C. (Kiln inclination: 0.5%, rotation speed: 1.3 rpm) A calcined product was prepared in the same manner as in Example 7 except that it was retained.

[0162] The obtained fired product was measured by X-ray diffraction to determine the decomposition rate of calcium carbonate. As a result, 30% of calcium carbonate was decomposed into calcium oxide. In addition, 100% of kaolin was converted to calcined kaolin, and talc was not decomposed at all.

[0163] Example 9 The same procedure as in Example 7 was performed except that the temperature of the heat treatment step was changed to 750 ° C. and the heating time was changed to 120 minutes. As a result, 100% of calcium carbonate was decomposed into calcium oxide, power oline was converted to 100% calcined kaolin, and talc was not decomposed at all.

[0164] Example 10

It carried out like Example 7 except having changed the granulation process and the heat processing process.

[0165] [Granulation process]

The sludge was molded to a diameter of 15 mm using a disk pelleter (manufactured by Dalton Co., Ltd.) and used as a raw material for the drying process and heat treatment process.

[0166] Treatment process]

The supply rate of the granulated paper sludge is 3.5 kg / h, the flow rate of unburnt material transport air stream A is 250 L / min, the sludge temperature is 600 ° C, and the heated part is 30 minutes (kiln slope: 2%, The number of rotations: 2. lrpm) was retained to prepare a primary-treated fired product. Next, the prepared primary treatment calcined product is supplied again to the rotary kiln 1, the flow rate of the air flow A for conveying unburned material is 200 L / min, the temperature of the secondary calcined product is 800 ° C, and the heating part is 70 minutes (kiln) (Tilt: 1%, rotation speed: 1. Orpm) was retained to prepare a fired product.

[0167] The resulting incinerated product was measured by X-ray diffraction to determine the decomposition rate of calcium carbonate. As a result, 100% of calcium carbonate was decomposed into calcium oxide. Further, 100% of kaolin was converted to calcined kaolin, and talc was not decomposed at all.

[0168] Example 11

This was carried out in the same manner as in Example 4 except that the calcined heat-treated product was used as it was as inorganic particles for papermaking fillers and coating pigments without performing the carbonation step. The obtained sludge fired product (inorganic particles) was measured by X-ray diffraction to determine the decomposition rate of calcium carbonate. As a result, 35% of calcium carbonate was decomposed into calcium oxide. Kaolin was transformed into 100% calcined kaolin, and talc was not decomposed at all. The obtained sludge product was not mixed with unburned material. The obtained inorganic particles are used as they are when used as a filler for papermaking, and when used as a coating pigment, the following dispersion process and pulverization process are additionally performed, and the coating pigment is used. It was.

[0169] [Dispersion process] The heat-treated fired product was dispersed in water using a coreless mixer so that the solid content was about 35%. At the time of dispersion, a polyacrylic acid-based dispersant (trade name: AALON T-50, manufactured by Toa Gosei Co., Ltd., described above) is added in an amount of 2.0 parts by weight relative to the solid content of the fired product. Was prepared.

[0170] [Crushing process]

[0171] Example 12

[0172] [Granulation process]

Sludge was formed into a Φ5mm X length of 15 mm using a disk pelleter (Dalton Co., Ltd.) and used as a raw material for the heat treatment process.

[0173] Treatment process]

Paper sludge supply rate is 3.5 kg / h, unburned material transport air flow rate is 500 L / min, sludge temperature is 750 ° C, heating time is 120 minutes (kiln slope: 1%, rotation speed: 0.95 rpm) A fired product was prepared in the same manner as in Example 7 except that it was retained. As a result, 100% of calcium carbonate was decomposed into calcium oxide, 100% of kaolin was transformed into 100% calcined kaolin, and talc was not decomposed at all.

Comparative Example 1 The procedure was the same as Example 9 except that the heat treatment step was changed as follows.

[0175] Treatment process]

Paper sludge of 3.5 kg / h was supplied from one end of a continuous direct heating rotary kiln (heating part: Φ 25 la x 180 cm) and discharged from the other end. The maximum temperature was set to 750 ° C and the product was allowed to stay inside the kiln for 60 minutes to prepare a fired product. Because it is a direct heating type, the furnace was directly heated from the sludge supply side with a so-called combustion kerosene burner, and the temperature was adjusted according to the amount of combustion. At this time, it was difficult to uniformly adjust the temperature in the direct heating kiln.

[0176] The incinerated product obtained was measured by X-ray diffraction to determine the decomposition rate of calcium carbonate. as a result In addition, 25% of calcium carbonate was decomposed into calcium oxide. In addition, 100% of kaolin was converted to calcined kaolin, and talc was not decomposed at all.

[0177] [Quality evaluation]

The fired product obtained by heat treating the paper sludge and the regenerated inorganic particles produced by the paper sludge force were evaluated by the following methods.

[0178] [Measurement of whiteness of burnt sludge and recycled inorganic particles]

About 10 g of the sample (dried product) is ground until coarse particles disappear in a mortar, and then pressurized with a powder sample molding machine (Rika Denki Kogyo Co., Ltd., Cat9302 / 30) at a pressure of lOOkN for 30 seconds. A powder sample was molded. The whiteness of the molded sample was measured according to JIS P8148 (2001) using a spectral whiteness colorimeter (SC-10WT model, manufactured by Suga Test Instruments Co., Ltd.).

[0179] [Abrasion test]

Using a wire wear tester manufactured by Oji-Ei Co., Ltd. and pumping a filler dispersion with a solid content of 5%, the test conditions (weight = 650 g, wire = plastic wire / SS-60, Nippon Filcon Abrasion degree test was performed using a product manufactured by using a product, and the wire wear resistance was evaluated based on the weight (mg) of the reduced wire. Also prepared 5 wt% slurry of light calcium carbonate (own product), heavy calcium carbonate (own product) and talc (trade name: SK-2, manufactured by Toyo Kasei Co., Ltd.) for comparison of wear test. Used as a sample.

○: Wire wear resistance is good.

○ ': The wire wearability is slightly poor, but is within the usable range.

X: Wire wear resistance is poor and cannot be used.

[0180] As described above, the heat treatment conditions, raw material shapes, presence / absence of carbonation process, quality of combusted products and inorganic particles in Examples;! It becomes as follows.

[0181] [Measurement of pH of inorganic particle dispersion]

The resulting dispersion of inorganic particles was measured using a Lacom Tester pH meter (pHScanWPBN type / manufactured by Azwan), and the pH of the pigment dispersion was measured by immersing the pH electrode directly in the various pigment dispersions. For the pH meter used for pH measurement, the NIST standard calibration solution (pH 6.86, PH calibration was performed using 2 types of pH 9.18 and pH 9.18. Examples:! ~ 10, 12 In Comparative Example 1, the pH was 9.6 to 10.5, and in Example 11, the pH was 10.5.

[table 1]

* ¹ Theory

* 2 Difficult to make uniform temperature throughout kiln

[0183] [Manufacture of double-layer coated paper]

Example 13

[Preparation of undercoat coating solution]

Recycled inorganic particle pigment obtained in Example 129 10% by mass, average particle size 2 m heavy calcium carbonate (trade name: Hyde Mouth Curve K-6, manufactured by Bihoku Powder Chemical Co., Ltd.) 90% by mass pigment slurry , 100 parts of pigment, oxidized starch (trade name: Ace B, manufactured by Oji Cornstarch) 4 parts, styrene-butadiene copolymer latex (trade name: T2628G, manufactured by JSR) 6 parts (all in terms of solid content) In addition, an antifoaming agent and a dye were added as auxiliary agents, and a coating solution having a solid content of 62% was finally prepared.

[0184] [Preparation of top coat liquid]

Fine kaolin (trade name: manufactured by Miragro Engelnode) 60% by mass, average particle size 1 · 3 ΐη heavy calcium carbonate (trade name: Hyde Mouth Curve Κ-9, manufactured by Bihoku Flour & Chemical Co., Ltd.) 40 mass% To 100 parts of pigment, 2 parts of oxidized starch (trade name: Ace Β, as described above), 10 parts of styrene butadiene copolymer latex (trade name: T2628G, as described above) per 100 parts of pigment (both solid content) In addition, an antifoaming agent and a dye were added as auxiliary agents, and finally a coating solution having a solid concentration of 65% was prepared.

[0185] [Preparation of double-layer coated paper]

Blade coater so that the dry weight per side is 7g / m ² on the high-quality base paper (70.Og / m ² ) with an intensity of 0.75g / cm ³ Was used for both-side coating and drying to provide an undercoat coating layer. Next, the coating solution for the top coating layer was coated on both sides using a blade coater and dried so that the dry weight per side was 9 g / m ² , thereby providing a top coating layer. The coated paper thus obtained was passed through a super calendar at a temperature of 70 ° C. and a linear pressure of 2 OOKN / m to obtain a coated paper.

[0186] Example 14

A coated paper was obtained in the same manner as in Example 13 except that the undercoat coating layer was changed as follows.

[Preparation of undercoat coating solution]

Heavy carbonate power of 30% by mass of regenerated inorganic pigment obtained in Example 129 and an average particle size of 2 m Lucium (trade name: Hyde Mouth Curve K-6, described above) 70 parts by mass of pigment slurry, 100 parts of pigment, oxidized starch (trade name: Ace B, previously described) 4 parts, styrene-butadiene Copolymer latex (trade name: T2628G, as stated above) 6 parts (both solid content conversion), defoamer and dye are added as auxiliary agents, and finally a coating solution with a solid content concentration of 59% is added. Prepared.

[0187] Comparative Example 2

A coated paper was obtained in the same manner as in Example 14 except that the pigment of the undercoat coating layer was changed to the regenerated inorganic particle pigment obtained in Comparative Example 1 and a coating solution having a solid content concentration of 60% was finally prepared. It was.

[0188] Reference Example 1

The coated paper was prepared in the same manner as in Example 14 except that the pigment of the undercoat coating layer was changed to the regenerated inorganic particle pigment obtained in Example 11 and finally a coating solution having a solid concentration of 50% was prepared. Obtained.

[0189] Reference Example 2

[Preparation of undercoat coating solution]

Average particle size 1.3 m Heavy calcium carbonate (Product name: No, Idoguchi curve K 9, previously described) 100% by weight of pigment slurry, 100 parts of pigment, oxidized starch (Product name: Ace B, as described above) 4 parts, styrene butadiene copolymer latex (trade name: T2628G, as described above) 6 parts (all in terms of solid content), defoamer and dye added as auxiliary, finally A coating solution having a solid concentration of 65% was prepared.

[0190] Reference Example 3

A coated paper was obtained in the same manner as in Reference Example 2 except that the pigment of the undercoat coating layer was changed to an average particle size of 2.0 μm heavy calcium carbonate (trade name: Hyde Mouth Curve K 6, previously described). .

[0191] Reference Example 4

A coated paper was obtained in the same manner as in Reference Example 2 except that the pigment of the undercoat coating layer was changed to fine kaolin (trade name: Miragro described above).

[0192] [Quality evaluation]

Summarizing the quality evaluation of the above examples, reference examples, and comparative examples, it is mainly as shown in [Table 2]. It becomes. Unless otherwise specified, the quality evaluation was performed by the following method in an environment of 23 ° C and 50RH%.

[0193] [Measurement of whiteness]

Using a spectral whiteness colorimeter manufactured by Suga Test Instruments Co., Ltd., measurement was performed in accordance with JIS P8148.

[0194] [Measure opacity]

Using a spectral whiteness colorimeter manufactured by Suga Test Instruments Co., Ltd., measurement was performed in accordance with JIS P8149.

[0195] [Measurement of glossiness of blank paper]

Measurement was performed in accordance with JIS Z8741 using a 75 ° gloss meter manufactured by Murakami Color Research Laboratory.

[0196] [Measurement of PPS smoothness]

Using a Parker Print Surf (PPS) surface smoothness tester (model name: MODEL M-569, manufactured by MESSMER BUCHEL, UK), backing disk: soft rubber, clamp pressure: 0.9. And the average was obtained.

[0197] [Printability evaluation]

On the RI printing machine, printing ink (trade name: FUSION— G ink, S type, manufactured by Dainippon Ink Chemical Co., Ltd.) was printed using 0.1 lcc, and the transferred ink density (ink fillability) In addition, the transfer uniformity (printing smoothness) of the ink was comprehensively observed and evaluated.

A: Printability is particularly excellent.

◯: Excellent printability.

Δ: Printability is slightly inferior, but there is no practical problem.

X: Printability is inferior.

[0198] [Ink set evaluation]

On the RI printing machine, print using 0 · 6cc of printing ink (trade name: FUSION— G ink, S type, as described above). After 3 minutes, the blank paper and the printing surface are overlapped, and then reprinted on the RI printing machine. The ink density transferred to the white paper was visually evaluated.

A: The ink set is particularly excellent very quickly.

◯: The ink set is excellent quickly.

Δ: Ink setting is a little slow, but there is no practical problem : Ink set is slow and there is a practical problem _c ]

[0200] [Manufacture of single-layer, double-sided coated paper]

Example 15

[Preparation of coating solution]

Recycled inorganic particle pigment obtained in Example 12 15% by mass, average particle size 1. Heavy carbonate power Lucium (trade name: Hyde Mouth Curve K 9, already described) 35% by mass, fine kaolin (Miradaros), already described 50 parts by weight of pigment slurry, 100 parts of pigment, oxidized starch (trade name: Ace B, described above) 4 parts, styrene monobutadiene copolymer latex (trade name: T2628G, previously described) 7 parts

(Both in terms of solid content) Further, an antifoaming agent and a dye were added as auxiliary agents, and finally a coating solution having a solid content concentration of 62% was prepared.

[0201] [Preparation of single-layer, double-sided coated paper]

Apply a blade coater to high-quality base paper (US basis weight 70.Og / m ² ) with a tension of 0.75 g / cm ^{3 so} that the dry weight per side is 8 g / m 2. Used to coat both sides and dry to provide a coating layer. The coated paper thus obtained was subjected to a temperature of 70 ° C and a linear pressure of 20

A coated paper was obtained by passing through a super calendar at OKN / m.

[0202] Comparative Example 3

A coated paper was obtained in the same manner as in Example 15 except that the pigment of the coating layer was changed to the regenerated inorganic particle pigment obtained in Comparative Example 1.

[0203] Reference Example 5

A coated paper was obtained in the same manner as in Example 14 except that the pigment in the coating layer was changed to the regenerated pigment obtained in Example 11 and a coating solution having a solid content concentration of 55% was finally prepared.

[0204] Reference Example 6

A coated paper was obtained in the same manner as in Example 14 except that the pigment of the coating layer was changed to fine kaolin (trade name: Miragro described above) and a coating solution having a solid content concentration of 65% was finally prepared. .

[0205] [Quality evaluation]

The data on the above examples, reference examples, and comparative examples are summarized in [Table 3]. The quality evaluation method was the same as in Table 2 above.

[0206] [Table 3] Example 1 5 Comparative Example 3 Reference Example 5 Reference Example 6 Example 1 2 Comparative Example 1 Example 1 1-Formulation Fine Kaolin Fine Kaolin Fine Kaolin Fine Kaolin

1 heavy ash 1 U heavy ash 1 heavy coal 1 ¾ ash

15 15 15 Number of copies 50 50 50 50

35 35 35 50 Paint concentration;% 62 62 55 65

Clams ：

Whiteness% 81.1 73.6 80.5 81.6 Opacity;% 86.3 86.5 86.1 85.5 White paper gloss: ° 53 53 45 55

PPS smooth! U m 1.42 1.95 1.65 1.55 Print gloss ○ ○ ○ ○ Ink set i Δ ○ ○

[0207] [Manufacture of filler-added paper]

Example 16

[Preparation of paper stock]

Hardwood pulp (LBKP freeness 450ml) slurry (concentration 2.5%), reclaimed inorganic particle filler 30% by mass obtained in Example 12, light calcium carbonate (trade name: TP-121, manufactured by Okutama Industries) 70 mass. 15 parts mixed filler slurry pulp absolute dry weight per / _0, cationic kaolinite powder (trade name: Ace K100, Oji Cornstarch Co., Ltd.) 0.8 parts of a band 0.5 parts of sulfuric acid, § Le Circe Ten dimer (trade name : Κ 287, manufactured by Arakawa Chemical Industries Co., Ltd.) 0.1 part was added to prepare a paper material having a solid content concentration of 0.5%.

[0208] [Create high quality paper]

The prepared stock is made with an on-top twin-wire paper machine, dried, and then coated with a gate roll coater so that the coated amount of oxidized starch is 5 gZm ² on both sides by dry weight. The machine calender was used to obtain a filler-added high-quality paper with a weight of 70 g / m ² .

[0209] Comparative Example 4

A filler-added fine paper was obtained in the same manner as in Example 15 except that the filler in the fine paper was changed to the recycled inorganic particle filler obtained in Comparative Example 1. [0210] Reference Example 7

A filler-added fine paper was obtained in the same manner as in Example 15 except that the filler in the fine paper was changed to 100% by mass of light calcium carbonate (trade name: TP-121, already described).

[0211] [Quality evaluation]

The data for the above examples, reference examples and comparative examples can be summarized as shown in [Table 4]. The quality evaluation was performed by the same method as in Table 2 and the following method in an environment of 23 ° C. and 50 RH% unless otherwise specified.

[0212] [Measurement of Clark stiffness]

Using a Clark stiffness tester manufactured by Kumagai Riki Kogyo Co., Ltd., measurement was performed in accordance with JIS P8143.

[0213] [Measurement of tensile strength]

Using a tensile tester manufactured by Shimadzu Corporation, measurement was performed in accordance with JIS P8113.

[0214] [Measurement of internal bond strength]

Measured according to JAPAN TAPPI 18-2 using an internal bond tester

[0215] [Table 4]

Claim: One embodiment of the present invention according to! To 15 is as described above. The force is as illustrated in FIGS. 1 to 3. Next, to solve the problems of the prior art described at the beginning The invention according to claims 16 to 27 is further adopted as a solution means. Claims 16-27 The embodiment of the invention is as illustrated in FIGS.

FIG. 4 shows a preferred flowchart of the method for producing inorganic particles according to the present invention. The raw material paper sludge as shown in the figure has a pretreatment consisting of washing → alkali metal compound addition → dehydration → drying → granulation, and consists of 17 fire combustion processes and secondary combustion processes. Both are used for two-stage combustion treatment. Then, the fired product after the combustion treatment is recovered as white inorganic particles through a post-treatment comprising the steps of suspension, carbonation, dehydration, dispersion, and pulverization.

[0218] As described above, raw material papermaking sludge is agglomerated and precipitated as a sludge recovery process for the wastewater discharged from various processes in the paper mill, such as the pulping process, paper manufacturing process, and used paper recycling process. · Concentration · Dehydration etc. can be used in combination as appropriate to recover the solids contained in each wastewater (various types of paper sludge) alone or mixed and used as raw material sludge. In addition, some of this paper sludge may contain low-grade waste paper that is difficult to reuse and RPF (Reibsed Paper & Plastic Fuel) mainly made of plastics.

[0219] The organic component in the papermaking sludge is derived from pulp, adhesive, RPF, etc. and has a flammability having functional groups such as carboxyl group, hydroxyl group, ester group, ether group in the molecule. And those that are hardly flammable, such as carbon black derived from printing inks in recycled used paper. On the other hand, the inorganic component (ash content) in the paper sludge is a main component in which kaolin (clay) and calcium carbonate derived from paper filler and coated paper pigment account for about 90 to 95% by weight of the total inorganic component. However, a small amount of talc or titanium dioxide is mixed!

[0220] The ratio of kaolin (clay), which is the main component of the inorganic component, and calcium carbonate varies slightly depending on the type of waste paper to be treated, etc. The weight ratio of kaolin / calcium carbonate is generally 20 / 80-80 The range is / 20. In addition, calcium (CaO equivalent), aluminum (AlO equivalent) and silicon (SiO equivalent) in the above inorganic components (ash)

2 3 2

The content ratio of calcium (aluminum / aluminum) is 13-73 / 12-40 / 15-47. In addition, the ratio of organic components to inorganic components in paper sludge varies somewhat depending on the type of waste paper to be processed and the degree of deinking process. The range is 30 / 70-80 / 20.

In the present invention, all the organic components contained in the papermaking sludge are surely burned and removed by the above-described at least two-stage combustion treatment. That is, the combustion treatment in the present invention is performed while transporting the raw papermaking sludge in the cylindrical heat treatment furnace, and the primary combustion process is performed under a combustion condition with a sludge temperature of 650 ° C. or less in an excess air atmosphere. The combustion process is set to combustion conditions with a sludge temperature of 700 to 850 ° C under an excess air atmosphere. An excess air atmosphere means an air atmosphere that does not cause incomplete combustion by giving a sufficient amount of oxygen to the combustion of organic components!

[0222] First, in the 17-fire combustion process, combustion conditions are relatively low in an excess air atmosphere, and therefore, easily combustible organic components in paper sludge are easily heated starting from functional groups in molecules. It decomposes and ignites and burns and disappears without charring. In the next secondary combustion process, high-temperature combustion conditions are obtained in an excess air atmosphere, so that the non-combustible organic components remaining without being combusted in the primary combustion process are also reliably burned and lost. In such a two-stage combustion process, it is reasonable to burn and remove easily combustible organic components without changing them into hard-to-burn carbides, and the entire organic components in paper sludge can be burned and removed efficiently in a short time. Yes. The obtained fired product does not contain unburned organic components such as soot and charcoal, and therefore can be suitably used for papermaking materials such as papermaking fillers and coating pigments having high whiteness.

[0223] Note that if the sludge temperature in the seven-fire combustion process exceeds 650 ° C, as described above, the readily combustible organic component is carbonized and changed to a hardly combustible organic component, and the combustion efficiency deteriorates. become. Also, if the combustion temperature in this 17-fire combustion process is too low, even the flammable organic components will be pyrolyzed and ignited and the combustion efficiency will deteriorate, so the lower limit of the sludge temperature should be 250 ° C. Force S desirable. Furthermore, the most suitable firing conditions for the 17 fire combustion process are the ranges where the sludge temperature is 350 to 630 ° C.

[0224] On the other hand, when the sludge temperature in the secondary combustion process is less than 700 ° C, it takes time to burn the non-combustible organic components, and the combustion efficiency deteriorates. On the other hand, when the sludge temperature becomes high temperature combustion exceeding 850 ° C., the suitability as a papermaking material is impaired by the formation of a hard sintered material generally called goulenite. In other words, when used in paper fillers and coating pigments prepared from fired products mixed with such hard sintered products, Damage to manufacturing equipment such as paper wires and coating blades will deteriorate manufacturing operability and adversely affect product quality. Therefore, the most suitable firing conditions in the secondary combustion process are the ranges where the sludge temperature is 750 to 800 ° C.

[0225] In addition to performing the combustion process in the two stages consisting of the primary and secondary combustion processes described above, the combustion process as a transition section from these 7 fire combustion processes to the secondary combustion process is sandwiched. It is also possible to divide one or both of the primary and secondary combustion processes into a plurality of combustion processes having different combustion temperatures (sludge temperatures) so that there are three or more stages.

[0226] Combustion treatment time in the 7-fire combustion process is preferably at least 10 minutes and not more than 5 hours, more preferably not less than 15 minutes and not more than 2 hours. There is a risk that combustion and removal of easily combustible organic components in the inside may be insufficient, and if it is too long, it will be a waste of heat energy. It is important to allow sufficient time for all flammable organic components to burn off. In addition, it is preferable that the combustion treatment time of the secondary combustion process be at least 10 minutes and not more than 5 hours. It is particularly preferable that the combustion treatment time is not less than 20 minutes and not more than 2 hours. There is a risk that the incombustible removal of the incombustible organic components may be insufficient, and if it is too long, heat energy is wasted. The ratio of the combustion treatment time of the 17 fire combustion process and the secondary combustion process is preferably in the range of 1/10 to 10/1 in the 17 fire combustion process / secondary combustion process.

[0227] The cylindrical heat treatment furnace used for the combustion treatment has a rotary kiln furnace called a rotary kiln and a screw kiln furnace depending on the transfer method of the workpiece. A rotary kiln furnace is preferable from the viewpoint of combustion efficiency. It is. The at least two stages of combustion treatment can be performed in a single cylindrical heat treatment furnace, or can be performed by using a plurality of cylindrical heat treatment furnaces different for each stage. It is more advantageous in terms of equipment efficiency and equipment cost to be performed based on the base.

[0228] It should be noted that when the combustion treatment is performed using the one cylindrical heat treatment furnace, the temperature rising region generated between the seven-fire combustion step and the secondary combustion step, specifically, the combustion temperature is 650 ° In the region where the temperature rises from C to 700 ° C, it is preferable to make it as short as possible, and it is particularly preferable that it be within 10 minutes. In this way, shortening the temperature rising region between the 17 fire combustion process and the secondary combustion process leads to compactness by shortening the overall length of the cylindrical heat treatment furnace, which is advantageous in terms of equipment efficiency and equipment cost. . [0229] As the heating method of the cylindrical heat treatment furnace, the indirect heating method (external heating method) is preferable to the direct heating method (internal heating method). In other words, in the direct heating method, a large amount of air (oxygen) is consumed to burn the heat source gas in the processing furnace, so there is a concern that the combustion of the organic components contained in the papermaking sludge becomes incomplete due to air shortage. In addition, the combustion of the heat source gas makes it very difficult to control the furnace temperature (sludge temperature). On the other hand, the indirect heating method does not consume furnace air for the heat source, so that the inside of the furnace can be reliably set to an excess air atmosphere and the degree of heating from the outside can be freely changed. This makes it extremely easy to control the furnace temperature.

[0230] As a heating means in the above indirect heating method, an electric heater or heating that can be induced by an induced current is possible. From the viewpoint of energy cost, kerosene is enclosed in a heating jacket surrounding the cylindrical furnace body. Introducing combustion gas such as oil and heavy oil, combustion exhaust gas discharged from existing incinerators, high-temperature air, superheated steam, etc., or heating by blowing combustion gas from the gas burner to the peripheral wall of the processing furnace Recommended. In addition, high-temperature exhaust gas that has undergone combustion treatment in the furnace body and combustion exhaust gas from the pretreatment drying step can also be used as part of the heating medium and heat source of the heating means.

[0231] It is recommended that the combustion air be supplied into the main body of the cylindrical heat treatment furnace from the fired product outlet side in order to produce a high-quality fired product. That is, air supply from the fired product outlet side causes the air flow direction in the furnace body to be opposite to the transfer direction of the workpiece (paper sludge and its fired product). Even if the unburned, non-combustible organic components are scattered in the furnace in the state of soot, the floating material such as soot is carried back to the raw material supply port side by the air flow and burned. Or, since it is discharged to the outside of the cylindrical heat treatment furnace along with the exhaust, it is possible to prevent the mixture of black unburned, non-combustible organic components into the fired product, thereby obtaining a fired product with high whiteness. . Therefore, the unburned, non-combustible organic components discharged to the outside of the cylindrical heat treatment furnace accompanying the exhaust are collected and removed by a bag filter, etc., and are combusted by an appropriate heating means together with the exhaust. It is better to make it disappear.

[0232] In order to supply the combustion air into the furnace main body from the fired product discharge port side as described above, air may be blown from the fired product discharge port side. The An inhalation method is preferred. In other words, forcibly exhausting from the raw material supply port side results in a negative pressure in the furnace, so if an air supply port is provided near the fired product discharge port, air is discharged from the air supply port by the negative pressure. It is automatically inhaled into the furnace. Thus, in such air supply by exhaust on the raw material supply port side, the air supply amount can be easily controlled by the exhaust amount, and air can be surely distributed over the entire length of the long furnace body by a stable air flow. That's the power S.

[0233] The above air supply amount is 1.;! To 5 times the oxygen amount of theoretical oxygen required for complete combustion of organic components contained in paper sludge when the furnace body is in an excess air atmosphere. The power to set the amount to give the amount S is preferable. 1. The amount that gives 5 to 5 times the amount of oxygen is more preferable, and the amount that gives 2 to 5 times the amount of oxygen is desirable. If this amount of air supply is too small, it will be difficult to make the furnace body into an excess air atmosphere, and the whiteness of the fired product may be reduced by the carbides remaining due to incomplete combustion of organic components. On the other hand, if the amount of air supply is too large, the inside of the furnace will be excessively cooled by the supply air, so it is necessary to increase the degree of heating by the heating means to maintain the combustion temperature, and the energy cost increases accordingly. become. Therefore, the combustion air only needs to contain oxygen that sufficiently burns organic components! /, So the amount of carbon dioxide is higher than normal outside air. ,.

[0234] If a suitable combustion treatment state of the papermaking sludge by the method of the present invention appears, in the 17-fire combustion process, a large amount of easily combustible organic components occupying most of the organic components in the sludge are sufficient oxygen. In the presence of, the flame is raised and burned, and this combustion continues to 1/2 to 2/3 of the 17 fire combustion process. Similarly, in the secondary combustion process, the remaining flame-retardant organic components burn, but even if they do not raise the flame due to their low content, the sludge is heated due to the high temperature of 700-850 ° C. However, it will be in a state of burning continuously.

FIG. 5 is a longitudinal side view schematically showing a rotary kiln furnace K1 of an indirect heating system which is a first structural example of a cylindrical heat treatment furnace used in the present invention. As shown in the figure, in the rotary kiln furnace K1, the outer periphery of a horizontal cylindrical rotary drum 9 that is a furnace body is surrounded by a heating jacket 20, and at one end of the rotary drum 9 on the raw material supply port 9a side, A raw material input port 2 is provided at a distance from the exhaust port 30, and a raw material supply means 10 such as a screw feeder is disposed between the raw material input port 2 and the raw material supply port 9a of the rotary drum 9. And also firing the other end of the rotating drum 9 Facing the product discharge port 9b, there is a power supply port 3 and a fired product discharge port 8!

[0236] In the heating jacket 20, hot air sent out through the hot air blowers 71 by the two systems of indirect heating means 5A and 5B for 17 fire combustion and secondary combustion respectively. From the plurality of discharge outlets 72 with valves, it is introduced separately into a front heating space 20a on the raw material supply port 9a side and a rear heating space 20b on the product discharge port 9b side. In addition, an exhaust means 4 such as an exhaust fan is interposed in the exhaust port 30, and the air in the rotary drum 9 is exhausted by the operation as shown by the broken arrow A, and due to the pressure reducing action accompanying this exhaust. External air is sucked into the rotary drum 9 from the air supply port 3. 6 is an exhaust circulation blower provided downstream of the exhaust port 30.

[0237] Although the rotary cylinder 9 is not shown in the strict illustration, the rotary cylinder 9 is inclined at a very gentle downward slope from the raw material supply port 9a side to the fired product discharge port 9b side. By the inclination and rotation of 9, the workpiece to be processed moves gradually from the raw material supply port 9a side to the fired product discharge port 9b side by gravity.

[0238] In order to perform the baking treatment of the papermaking sludge S by the rotary kiln furnace K1 having the above-described configuration, as shown by the solid arrow B, the papermaking sludge S of the raw material charged into the raw material inlet 2 is supplied to the raw material In the process of feeding to the raw material supply port 9a of the rotation month 9 by means 10 and transferring to the calcined product discharge port 9b by the rotation of the rotation month 9, the indirect heating by hot air introduced into the heating jacket 20 The organic components in the sludge S are combusted in two stages: the seven-fired combustion process and the secondary combustion process described above.

That is, in this two-stage combustion treatment, the entire interior of the rotary drum 9 is maintained in an excess air atmosphere by the intake of air from the air supply port 3 accompanying the exhaust from the exhaust port 30 due to the operation of the exhaust means 4. While holding the two heating systems 5A and 5B, the heating degree is adjusted by the temperature and the introduction speed of the hot air introduced into the front heating space 20a and the rear heating space 20b in the heating jacket 20, respectively. As shown by the phantom line c in the figure, the sludge temperature 650 ° C or less (preferably 650 ° C or less At 250 ° C or more, optimally 350 to 630 ° C), and the sludge temperature 700 to 85 0 ° with the rear region in the rotary drum 9 corresponding to the rear heating space 20 b as the secondary combustion zone Z2 C (preferably 750 to 800 ° C). [0240] As a result, the papermaking sludge S is combusted and removed without carbonizing the combustible organic components contained in the process of passing through the seven-fired combustion zone Z1, and then contained in the process of passing through the secondary combustion zone Z2. The burned-off organic components are burned and removed, and are discharged from the burned product outlet 9b of the rotary drum 9 as a high-whiteness burned product that does not contain unburned organic components and hard sintered products. It is taken out of the furnace through the material outlet 8.

[0241] The processing time (passing time) in both combustion zones Zl and Z2 may be set according to the rotational speed and the degree of inclination of the rotating drum 9. Further, the length ratio of both combustion sections Zl and Z2 in the rotary drum 9 is preferably in the range of 1/10 to 10/1 in the primary combustion process / secondary combustion process as described above. The indirect heating means 5A, 5B can be arbitrarily adjusted according to the relative ratio of the size of the region where hot air is introduced into the heating jacket 20 respectively. However, various measurement means such as thermocouples and infrared temperature sensors can be used for temperature measurement to control the combustion temperature (sludge temperature) in both combustion zones Zl and Z2. Thermocouples are preferred from the standpoint of performance and cost.

[0242] On the other hand, since the exhaust from the exhaust port 30 is in a high temperature state due to combustion, it is sent to the hot air circulation system by the exhaust circulation blower 6 and used as a heat source in the pretreatment drying step shown in the flowchart of FIG. Indirect heating means 5A, 5B is used as a hot air or part of the heat source. It is to be noted that combustion exhaust gas from a pretreatment drying process or the like can be used as the hot air of the indirect heating means 5A and 5B and its heat source.

[0243] Fig. 6 is a longitudinal side view schematically showing a rotary kiln furnace K2 of the indirect heating method, which is a second structural example of the cylindrical heat treatment furnace used in the present invention. Constituent elements common to the rotary kiln furnace K1 in the first structural example shown are denoted by the same reference numerals. This rotary kiln furnace K2 has a force S that is almost the same as the rotary kiln furnace K1 in the first configuration example, and the front heating space 20a and the rear heating space 20b in the heating jacket 20 are blocked by the partition member 11. Has been. The partition member 11 is formed by shaping a material that can withstand the high temperature of the combustion process, such as metal, ceramics, and bricks, into a required shape.

[0244] In the rotary kiln furnace K2 of this second configuration example, the relatively low temperature hot air introduced into the front heating space 20a in the heating jacket 20 by the indirect heating means 5A and the indirect heating means High temperature heat introduced into the rear heating space 20b in the heating jacket 20 by 5B Because it does not mix with the wind, it becomes easier to control the heat treatment temperature in the seven-fire combustion zone Z1 and the secondary combustion zone Z2 in the rotary drum 9, and the temperature difference between both zones Zl and Z2 can be maintained stably. As a result, a high-quality fired product can be obtained, and the length of the transition region where the temperature changes between both sections Zl and Z2 can be shortened. There is an advantage that the rotary cylinder 9 can be made compact and the equipment cost can be reduced.

[0245] Fig. 7 is a longitudinal side view schematically showing a rotary kiln furnace K3 of the indirect heating method, which is a third structural example of the cylindrical heat treatment furnace used in the present invention. Constituent elements common to the rotary kiln furnaces Kl and K2 of the first and second configuration examples shown in FIG. 6 are denoted by the same reference numerals. In the rotary kiln furnace K3 of this third configuration example, the outer periphery of the rotary drum 9 is surrounded by heating jackets 20A and 20B separated into a raw material supply port 9a side and a fired product discharge port 9b side, and both heating jackets 20A and 20B are enclosed. An intermediate air inlet 3B is provided at the boundary.

[0246] In this rotary kiln furnace K3, as with the rotary kiln furnaces Kl and K2 of the first and second configuration examples, hot air from two systems of indirect heating means 5A and 5B is used for both heating jackets 20A, 20 By introducing each heating space in 20B separately into 20Aa and 20Bb, the front region in the rotary drum 9 corresponding to the front heating space 2OAa has a sludge temperature of 650 ° C or less (preferably 650 ° C or less In the primary combustion zone Z1 of 250 ° C or higher, optimally 350 to 630 ° C, the rear region in the rotary drum 9 corresponding to the rear heating space 20Bb is sludge temperature 700 to 850 ° C (preferably 750 ~ 800 ° C) is set in the secondary combustion zone Z2.

[0247] However, in this rotary kiln furnace K3, the air in the rotary drum 9 is forcibly exhausted from the exhaust port 30 near the raw material supply port 9a by the exhaust means 4, and accordingly, Force to suck air from the outside due to negative pressure generated at the fired product discharge port 9b side and air supply ports 3A and 3B are provided at two places in the middle. For this reason, due to the suction from the air supply ports 3A and 3B, the airflow A2 from the air supply port 3B is added to the airflow A1 from the air supply port 3A in the intermediate position to the airflow A1 from the air supply port 3B in the rotary drum 9, and both airflows Al The air flow A3 that merges A2 passes through the primary combustion section in the rotary drum 9 and is discharged from the exhaust port 30.

[0248] As described above, if the combustion air is supplied into the rotary drum 9 with two powers, the air supply port 3A on the fired product discharge port 9b side and the intermediate air supply port 3B, the primary combustion process is performed. Rotating month Since fresh air (outside air) that contains enough oxygen is supplied to 1 7 fire combustion zone Zl in 9, the excess air atmosphere in 1 7 fire combustion zone Z1 is stably maintained, so paper sludge S Combustible organic components can be reliably removed without being carbonized. In addition, the air flow in the secondary combustion zone Z2, which has a high combustion processing temperature, moves to the primary combustion zone Z1, but by supplying low temperature air (outside air) through the intermediate air inlet 3B, the air flow is reduced. It becomes easier to stably maintain a relatively low combustion temperature in the fire combustion zone Z1. Note that it is preferable that the opening degree of such an air supply port can be adjusted manually or remotely to control the combustion temperature stably.

FIG. 8 shows an example of the structure of the rotary drum 9 portion in the rotary kiln furnace K3 of the third configuration example. The rotating drum 9 has a structure in which cylindrical bodies 9A and 9B having different diameters are concentrically arranged so that they are partially overlapped so that the small diameter cylindrical body 9A is on the raw material supply port 9a side. An annular gap formed in the overlapping part is used as the intermediate air supply port 3B. In this case, the papermaking sludge S supplied to the raw material supply port 9a is sequentially moved in the small-diameter cylindrical body 9A and the large-diameter cylindrical body 9B as indicated by an arrow B by the rotation of the rotary cylinder 9 as a whole. The organic components are removed by combustion and discharged from the fired product outlet 9b. In addition, in the rotating drum 9, by means of forced exhaust by the exhaust means 4 (see Fig. 7), in addition to the air flow A1 from the air supply port 3A on the fired product discharge port 9b side, the intermediate air supply port 3B Fresh air is also inhaled as the air flow A2

Yes

[0250] Various structures other than those illustrated in Fig. 8 can be adopted for air supply from the intermediate position of the rotary drum 9 such as the rotary kiln furnace K3 of the third configuration example.

[0251] The furnace body of the cylindrical heat treatment furnace used in the present invention is not limited to the horizontal cylindrical type such as the rotary drum 9 in the rotary kiln furnaces K1 to K3 of the first to third configuration examples described above. By providing partitions and partitions inside, it is possible to adopt a rotating cylinder with a multi-divided structure in which the interior is divided into a plurality of compartments and a multi-cylinder (tube bundle) multi-chamber structure. Figures 9 to 11 show examples of these multi-divided structures and a multi-chamber structure with multiple bodies (tube bundles). 9 to 11 are cross-sectional views (radial cross-sectional views) in a direction orthogonal to the longitudinal direction of the horizontally long rotating drum, and the vertical direction of the figure matches the actual vertical direction. Yes.

[0252] The rotating drum 9 shown in Fig. 9 (a) has a six-partitioned partition structure having a substantially hexagonal outer shell 12a. The inside is divided into six compartments 13... Having an equilateral triangular section by a partition wall 12 b having a hexagonal section. FIG. 9 (b) shows the stacking-deposition state of the papermaking sludge S in each compartment 13 when the rotating cylinder 9 supplied with the granulated material of the papermaking sludge S is rotated in the direction of arrow C. Yes.

[0253] A rotating drum 9 shown in Fig. 10 (a) has a six-cylinder multi-cylinder (tube bundles) in which six pipe parts 14 ··· are bundled in a substantially annular shape by a donut plate-like pipe part fixing member 15. The central cavity portion 16 surrounded by the six pipe portions 14... Is communicated in the axial direction through the center hole 15a of the pipe portion fixing member 15. FIG. 10 (b) shows the lamination-deposition state of the papermaking sludge S in each pipe section 14 when the rotating cylinder 9 supplied with the granulated material of the papermaking sludge S is rotated in the direction of arrow C. Yes.

[0254] The rotating drum 9 shown in Fig. 11 (a) has a 12-partitioned partition structure, and an annular space between the inner cylinder part 17a and the outer cylinder part 17b forming a double pipe is formed by 12 partition walls 17c ... Twelve compartments 18 are formed by dividing radially, and a hollow portion 16 is formed inside the inner cylindrical portion 17a. Figure 11 (b) shows the stack of papermaking sludge S in each compartment 18 when the rotating cylinder 9 supplied with the granulated material of papermaking sludge S rotates in the direction of arrow C.

Deposition state is shown.

[0255] As illustrated in Figs. 9 to 11, if the horizontally long rotating cylinder 9 is formed into a multi-partition structure or a multi-cylinder (tube bundle) multi-chamber structure, the supplied papermaking sludge S is divided into a plurality of sections. Since it is distributed in small quantities to the chamber and torso, the object to be processed in the transfer process in the rotating cylinder 9 is compared with a simple horizontal cylindrical rotating cylinder that forms a single furnace space as a whole. As the accumulated thickness of (paper sludge S, fired product) becomes much smaller, the stir action of the object to be processed accompanying the rotation of the rotary drum 9 becomes stronger, and the air (oxygen) and the object to burn organic components are burned. The contact efficiency with the treated product is remarkably improved, so that the combustion efficiency of the organic component is remarkably increased, and a high-quality fired product and thus inorganic particles can be obtained.

[0256] Note that the number of divisions of the transfer path in such a multi-divided structure or tube bundle (multi-cylinder) multi-chamber structure is at least 6 or more in order to sufficiently exert the above-described effects. Recommended. Further, the divided structure of the rotary cylinder is not limited to the structure illustrated in FIGS. 9 to 11, but may be, for example, a multi-partition partition structure such as an 18-part type, a 24-part type, or a 36-part type described later, Various structures are possible, such as a rotating cylinder structure having a multi-cylinder / multi-divided structure in which a partition or partition is provided for each tubular member and the total number of divisions is 6 to 126. Furthermore, in addition to the structure of the rotary drum and the tubular member, the inside of the tubular member is partitioned into a plurality of compartments by a partition wall, and a driven stirring blade having a shape similar to the partition wall described later is provided in the rotary drum and the tubular member. It is also possible to divide the inside of the rotary cylinder into a plurality of compartments and distribute the papermaking sludge S supplied to the compartments to the compartments! ,.

[0257] Also, as shown in Figs. 10 and 11, when a rotary cylinder 9 having a multi-divided structure or a multi-cylinder (tubular bundle) structure having a hollow portion 16 along the axial direction is employed, If indirect heating is performed from the inside (center side) using the cavity 16 in addition to indirect heating from the combustion chamber, the combustion temperature can be controlled more accurately and higher heat treatment efficiency can be achieved. . As the indirect heating means from the inside, various heat media and heat sources similar to the indirect heating means from the outside described above can be adopted.

[0258] Fig. 12 is a longitudinal side view schematically showing a rotary kiln furnace K4 of the indirect heating method, which is a fourth structural example of the cylindrical heat treatment furnace used in the present invention, and is described in Figs. Constituent elements common to the rotary kiln furnaces K1 to K3 of the first to third configuration examples shown in FIG.

[0259] In this rotary kiln furnace 4, the rotary drum 9 has a hollow portion 16 along the axial direction as shown in Figs. 10 and 11, and is heated from the outside of the rotary drum 9. In addition to the indirect heating means 5Α and 5Β, the cavity 16 is also provided with indirect heating means 5C and 5D for heating the rotary drum 9 from the inside. These indirect heating means 5C and 5D for the inside release the hot air sent through the respective hot air blowers 71 from the outside through a plurality of air supply ports 3A and into the hollow portion 16 respectively. The outlet 72 is divided into a front heating space 16a on the raw material supply port 9a side in the cavity 16 and a rear heating space 16b on the fired product discharge port 9b side. As shown in FIG. 12, the front heating space 16a in the cavity 16 is divided into the front heating space 20a into which the hot air by the indirect heating means 5A in the heating jacket 20 is introduced. Similarly, the rear heating space 16b corresponds to the rear heating space 20b into which hot air from the indirect heating means 5B in the heating jacket 20 is introduced. [0260] Therefore, in the combustion treatment of the papermaking sludge S by this rotary kiln furnace K4, the front region in the rotary drum 9 sandwiched between the inner and outer front heating spaces 16a and 20a is used as an indirect combustion zone Z1. The sludge temperature is set to 650 ° C or less (preferably 650 ° C or less, 250 ° C or more, optimally 350 to 630 ° C) by indirect heating from inside and outside by heating means 5A and 5C. Similarly, the rear region in the rotary drum 9 sandwiched between the inner and outer rear heating spaces 16b and 20b is formed as a secondary combustion zone Z2 by indirect heating from the inside and outside by indirect heating means 5B and 5D. Set the sludge degree to 700 to 850 ^o G (preferably 0.75 to 800 ^o G).

[0261] As in the rotary kiln furnace K4 of the fourth configuration example, when indirectly heating from the inside using the hollow portion 16 along the axial center direction of the rotary drum 9, the indirect heating outside and Similarly, if two types of indirect heating means 5C and 5D are used for primary combustion and secondary combustion, in addition to improving the heat treatment efficiency by indirect heating of the inner power, etc., the 7 fire combustion process (1 7 There is an advantage that it is easier to control the combustion treatment temperature in the fire combustion zone Z1) and the secondary combustion process (primary combustion zone Z2).

[0262] In the combustion treatment as described above, it is contained in the raw paper sludge! /, The power that calcium carbonate is thermally decomposed (decarboxylated) and converted into calcium oxide. It is preferable to set it to 50% or more of the total amount of calcium carbonate before the combustion treatment. In particular, the decomposition rate is preferably 90% or more, more preferably substantially 100%. In the present invention, since the calcium oxide produced by the above pyrolysis can be returned to the original calcium carbonate in the post-treatment carbonation step described later, it is not necessary to suppress the production of calcium oxide in the combustion treatment. This is because the firing treatment is performed at a temperature higher than the thermal decomposition temperature of calcium carbonate, 525 ° C, so that the organic components can be removed preferentially. If the decomposition rate of calcium carbonate in the combustion process is less than 50%, as described above, the organic components in the sludge are burned and removed at the combustion temperature of 700 ° C or higher in the secondary combustion process. It is expected to have the opposite effect of suppressing the thermal decomposition of calcium carbonate that occurs at a temperature lower than about 525 ° C, so it must be inefficient and the desired high-grade sludge incineration It is not suitable for obtaining ash at a high rate.

[0263] Next, various pretreatments performed on the raw papermaking sludge S before being subjected to the above-described firing treatment will be described in the order of steps shown in the flowchart of FIG. The first In the washing process, the papermaking sludge used as a raw material is washed with water.

[0264] [Raw material sludge]

First, as described above, raw paper sludge is agglomerated, settled and concentrated as a sludge recovery process for wastewater discharged from various processes in the paper mill, such as the pulping process, paper manufacturing process, and used paper recycling process. · Use a combination of steps such as dehydration as appropriate to recover the solids contained in each wastewater (various types of papermaking sludge), either alone or mixed and used as a raw material sludge.

[0265] Among these, sludge from the used paper recycling process is agglomerated and separated from the deinked waste liquid separated and discharged from the used paper pulp by pressurized flotation (flow-tessellation or flotation) and / or washing in the used paper deinking process. It is recommended to perform dehydration and collect the solid content in the deinking wastewater as deinking sludge. Also, when recovering waste paper raw materials with low whiteness and sludge, sufficiently perform deinking and flotation in the used paper recycling process to remove ink particles including carbon black as much as possible. Multiple sludge pressurization and / or washing steps can be added as needed. In addition, the deinking sludge collected from the used paper deinking process is classified into high-quality used paper, newspaper used paper, magazine (coating paper) used paper, etc., and deinked sludge for each type of used paper is prepared. It is possible to use deinked wastepaper by type of wastepaper alone or in combination as raw material sludge as appropriate.

[Alkali metal compound addition step]

This is a pretreatment technique found by the present inventors. By adding an alkali metal compound to paper sludge as a raw material, the alkali metal is used for thermal decomposition and combustion of organic components in the subsequent combustion treatment. On the other hand, it acts as a kind of catalyst, and combustion efficiency is improved. And it has been found that such effects are effective not only for flammable organic components, but also for non-flammable organic components that are poor in functional groups that are the starting point of thermal decomposition and ignition. ing.

[0267] The alkali metal compound to be added is not particularly limited, but sodium or potassium hydroxides and carbonates are preferable from the viewpoint of the safety (harmful physical properties) of the alkali metal soluble in water. . In contrast, halides such as sodium chloride and potassium chloride In addition, alkali metal strong acid salts such as nitrates such as sodium nitrate and potassium nitrate and sulfates such as sodium sulfate and potassium sulfate have an effect of improving the combustion efficiency as an alkali metal compound, but hydrogen halide ( Hydrogen chloride), nitric acid, sulfuric acid, and other strong acids are generated, which may cause corrosion of the metal material constituting the cylindrical heat treatment furnace. In addition, these alkali metal compounds may be added to sludge before and after dehydration treatment, including sludge before dehydration treatment, which may be in the form of granular or powdered solid and aqueous solutions, or misalignment. From the viewpoint of uniformity and ease of adjusting the addition amount, a method of adding to the raw material sludge before dehydration in the form of an aqueous solution or a method of spraying to the sludge before drying is preferable.

[0268] The amount of alkali metal compound added to the papermaking sludge is within the range of 0.001 to 5.0 parts by weight in the absolute dry weight of 100 parts by weight of the sludge in the case of alkali metal hydroxide. In particular, the range of 0.;! To 1.0 parts by weight is optimal. Therefore, if this addition amount is too small, a sufficient effect cannot be obtained. On the other hand, if the amount added is too large, it is wasted and, when the alkali metal compound is a hydroxide, the pH of the sludge is strongly alkaline due to excess alkali, and care must be taken when handling the sludge. This is not preferable.

[0269] [Dehydration process]

Examples of methods for recovering raw material sludge as solids from papermaking sludge-containing wastewater include methods such as filtration, centrifugation, pressure dehydration, and pressing, as described above. Get rate papermaking sludge. As a suitable filtration device, there is a filtration device called a rotary screen, and as a dehydration device, there is a pressurization / squeeze dehydration device called a screw press. Or they can be used in appropriate combinations.

[0270] The solids concentration in the sludge varies depending on the capacity of the dehydrator, so it is usually 5 to 60% by mass. However, if the solid content exceeds 60% by mass, the capacity of the current dehydrator or concentrator It is difficult to achieve.

[0271] [Drying process]

In the present invention, the solid content concentration of sludge used in the heat treatment step is particularly limited. However, as described above, from the viewpoint of reducing the energy cost during the heat treatment process and from the viewpoint of reducing the heat treatment apparatus, it is preferable to increase the solid content of the sludge as much as possible. It is good to do. However, although the dehydration process alone varies depending on the capacity of the dewatering device, the solid content concentration is approximately 5 to 60% by mass, so it is recommended to further increase the solid content concentration by drying treatment.

[0272] In order to increase the solid content concentration of the sludge, it is preferable to provide a drying step for drying the sludge before the heat treatment step, as shown in FIG. As described above, the dryer used in the drying process is not limited to a direct heating type rotary kiln, an indirect heating type rotary kiln, an air flow dryer, a fluidized bed dryer, an oscillating fluid dryer, a rotary / aeration rotation. It is possible to use a dryer (cyclone). In addition, as a heat source for these dryers, it is possible to reduce the energy cost by using the exhaust heat of the baking treatment process described later.

Yes

[0273] As described above, the temperature of the drying process is not limited to hot air to prevent sludge from burning or carbonization in an apparatus that uses hot air such as an air dryer or a rotary / aeration rotary dryer. The temperature is preferably 600 ° C or lower, and particularly preferably 250 ° C or lower. If this hot air temperature is too high, sludge will ignite, and if the firing conditions at that time are not appropriate, there is a concern that easily combustible organic components will carbonize and become non-combustible. In addition, in the drying process, it is preferable that the sludge be squeezed in order to improve drying efficiency. Forcibly, the sludge is forcibly released by a mechanical roll or the like. It is preferable to classify to about 2000 m and dry.

[Granulation process]

The dried papermaking sludge is formed into an appropriate particle size by an appropriate means. In other words, the papermaking sludge used as a raw material in the present invention is too fine if it has a form and particle size that can burn organic components in contact with air (oxygen) while being transported in a cylindrical heat treatment furnace. However, even if the deposited layer becomes dense and air does not easily enter the layer, the air spreads to the inside of the lump even if it becomes coarse like a lump, and the combustibility of organic components deteriorates. In order to reduce the whiteness of the fired product due to unburned carbide, it is preferable to granulate to a certain size. [0275] As granulation means, pellet granulation is generally performed by a compression molding machine such as a pricket machine or a roller compactor, an extrusion molding machine such as a disk pelleter, and a rolling granulation method or a stirring granulation method. In addition to a simple granulation method, when water-containing paper sludge after dehydration is put into a drying device or a cylindrical heat treatment furnace, it is granulated using a conveying device having a shearing action such as a screw feeder. It is also possible to carry out granulation using the paper sludge transport movement during the drying process.

[0276] The granulated particle size is preferably in the range of about 2 to 30 mm in length or diameter, and more preferably in the range of 3 to 20 mm. If the particle size is out of this range, for example, about lmm, it will not be able to come into sufficient contact with the surrounding air during combustion, and it will easily become unburned. In addition, if it exceeds 30 mm, it becomes difficult to burn completely to the center. The particle shape of the granulation is not particularly limited, such as a columnar shape, a spherical shape, an ellipse, a triangle, other polygonal shapes, or those having concave and convex shapes.

[0277] Next, various post-treatments for the fired product obtained by the firing treatment will be described in the order of steps shown in the flowchart of Fig. 4 described above.

[Suspension process' Carbonation process]

The fired product obtained by the combustion treatment is mixed with water and stirred to form a suspension, and a carbon dioxide gas is blown into the suspension to carbonize the fired product. This is because when the raw paper sludge contains carbonic acid lucium, the carbon dioxide (CaCO 3) to carbon dioxide (CaCO 3) in the combustion process.

Three

CO) is released to generate calcium oxide (CaO) S

2

When machine particles are used in papermaking materials such as paper fillers and coating pigments, alkalinity becomes extremely strong, and problems such as increased viscosity and poor pigment dispersion occur. Calcium oxide is converted to calcium hydroxide (Ca (OH)) and then carbonized.

2

To return to calcium carbonate.

[0279] Since the purpose of the suspension process is to convert calcium oxide to calcium hydroxide before returning it to calcium carbonate as described above, there are no particular restrictions, but low V, treatment temperature However, it takes a long time to make a suspension, while high! /, And the processing temperature is expensive and expensive to maintain, so it is preferable to set the processing temperature to 20 to 80 ° C. A temperature of 40 to 60 ° C is particularly preferable. By the way, if the processing temperature is about 60 ° C, Suspension can be completed in about 60 minutes. In addition, the solid content concentration of the suspension is effective in performing the carbonation treatment in the subsequent carbonation step, and maintaining the viscosity of the suspension low to maintain good fluidity and fluidity. And it is preferable to set it as 5-20 mass%.

[0280] In addition to the sludge calcined product of the present invention, calcium oxide (CaO: quick lime) or calcium hydroxide [Ca (OH): slaked lime] is separately added to the calcined product suspension as necessary. Attendant

2

[0281] In the carbonation step, carbon dioxide gas is blown into the suspension of the calcined product. However, since high purity carbon dioxide gas is uneconomical, the carbon dioxide concentration is industrially 5-40. It is preferable to use a carbon dioxide-containing gas of about volume%, particularly preferably about 10 to 35 volume%. Examples of such carbon dioxide-containing gas include sludge combustion exhaust gas, limestone calcined exhaust gas, lime calcined exhaust gas, waste incineration exhaust gas, power generation boiler exhaust gas, exhaust gas from causticized calcium carbonate calcined kiln used in pulp manufacturing process, etc. Various combustion exhaust gases can be used after dust removal by an appropriate means. If the carbon dioxide concentration of the blown gas is too low, the carbonation takes a long time, and the productivity of the inorganic particles decreases accordingly. On the other hand, a high preparation cost is required to set a high carbon dioxide concentration.

[0282] The amount of carbon dioxide blown in the carbonation step is preferably 0.5 to 15 liters / minute as carbon dioxide gas with respect to 1 kg of calcium hydroxide solid content in the fired suspension. If the amount is too small, it takes time for carbonation to reduce the productivity of inorganic particles. On the other hand, if the amount is too large, the power load for blowing becomes large, which is uneconomical. In addition, the temperature of the calcined suspension during carbonation (carbonation reaction temperature) is preferably about 30 to 80 ° C, particularly 40 to 70 ° C, and if it is too low, the efficiency of the carbonation reaction is increased. Conversely, even if it is too high, the carbon dioxide gas is not sufficiently dissolved in the suspension, leading to a reduction in the efficiency of the carbonation reaction.

[0283] In the carbonation step, the calcium carbonate to be produced is made into a desired crystal shape. In addition, a seed crystal of calcium carbonate having the crystal shape may be added to the fired product suspension.

[0284] Since the carbonized product obtained by carbonating the fired product as described above is white inorganic particles having a large particle size suitable for a papermaking filler, a suspension of the carbonized product is obtained. As it is, it can be used as a filler for papermaking by blending it with raw materials for papermaking such as pulp.

[Dehydration process 'Dispersion process' Grinding process]

The carbonation product obtained from the carbonation step is dehydrated and then dispersed and pulverized to obtain a high-concentration slurry of fine white inorganic particles suitable as a pigment for coated paper. In the dehydration process, as in the dehydration process in the pretreatment described above, a carbonized product having a required water content is obtained from a suspension of the carbonated product by filtration, centrifugation, pressure dehydration, squeezing, etc. To do. As a suitable dehydrating apparatus, there is a press filtration apparatus called a filter press, and a dehydrated cake of a carbonized product can be obtained. Then, in the next dispersion step, the force of adding water to the dehydrated cake-like carbonated product to form a high-concentration slurry. The dispersion operation involves stirring, crushing, and dispersion performed in the usual dispersion treatment. Various methods can be adopted. Further, by adding a dispersing agent during the dispersing operation, the inorganic particles are in a favorable dispersed state, and the quality and handling properties as a papermaking material are improved. As such a dispersant, a general dispersant used in the production of papermaking materials can be used, and specific examples thereof include synthetic polymer-based dispersants such as sodium polyacrylate.

[0286] It should be noted that the suspension of the carbonation-treated product that has undergone the carbonation step is preferably filtered through a sieve such as a vibrating sieve before dehydration, and a liquid cyclone is used before the filtration. A classification treatment is preferably performed. That is, the above filtration treatment removes silicon-containing particles such as α-quartz and coarse particles mixed into the carbonized product, and thus wear of the papermaking tire can be reduced. Further, if the classification process using a liquid cyclone is performed before the filtration process, there is an advantage that clogging of the sieve of the subsequent filtration process can be prevented.

[0287] In the pulverization step, the inorganic particles after the dispersion treatment are pulverized into fine particles, whereby the inorganic particles are made into high-quality white inorganic particles suitable as a coating pigment. As a pulverizing apparatus for this pulverization step, a sand mill, a wet type generally used in the manufacture of papermaking materials are used. Can use ball mills, vibration mills, stirring tank mills, flow tube mills, coball mills, etc.

[0288] The inorganic particles obtained from the papermaking sludge as a raw material according to the present invention have a high whiteness and do not contain a hard sintered product. Therefore, as described above, a papermaking material such as a papermaking filler or a coating pigment is used as it is. It can be used as a material for paper, and can also be used by mixing with various inorganic pigments used as paper materials such as calcium carbonate, talc, kaolin, firing power, titanium dioxide, satin white, and silica.

[Examples] Comparative Examples

EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited thereto. Unless otherwise specified, “parts” and “%” in the examples represent “parts by mass” and “% by mass”, respectively.

[0290] Example 17

In the waste paper deinking process, which is mainly used for magazine waste paper at a paper mill with a waste paper processing facility, a flocculant is added to the foamy deinking flotation waste liquid that has been floated and separated from waste paper pulp by the floatation method (floatation method). After adding and aggregating the solid content in the waste liquid, the liquid was passed through a rotary screen and a screw press in order to recover papermaking sludge (deinking sludge) having a solid content of about 50%. Next, use a dryer to dry to a solid content of about 75%, and then granulate and form pellets with a diameter of about 5 mm and a length of about 15 mm using a disk pelleter, and finish the pretreatment. It was. Then, the paper sludge granulated material after this pre-treatment is used in the rotary kiln furnace K2 (Takasago Kogyo Co., Ltd., externally heated rotary kiln manufactured by Takasago Industries, Ltd. ) Was used for combustion treatment.

[0291] In this combustion treatment, raw paper sludge granulated material S is supplied from the raw material input port 2 at a supply speed of 3.5 kg / h using a hopper, and is rotated by a screw feeder which is a raw material supply means 10. A two-stage combustion process was performed in the seven-fire combustion zone Z1 and the secondary combustion zone Z2 while being fed into the raw material supply port 9a of the barrel 9 and being transferred through the rotary drum 9. In both combustion sections Zl and Z2, the combustion gas from the combustion boiler (not shown) is used as a heat source, and the combustion to the front and rear heating spaces 20a and 20b of the heating jacket 20 by the indirect heating means 5A and 5B is performed. The heat treatment temperature is controlled by the amount of gas introduced, and the seven-fire combustion zone Z1 is sludge temperature 600 ° C. The treatment time (sludge retention time) was set to about 40 minutes, and the secondary combustion zone Z2 was set to a sludge temperature of 800 ° C and the treatment time was set to about 90 minutes. On the other hand, combustion exhaust gas is exhausted from the rotary drum 9 by the exhaust fan of the exhaust means 4 at 100 L / min (air temperature converted to 20 ° C), and the same amount of exhaust gas exhausted from the exhaust port 30 due to the decompression action associated therewith. Outside air was sucked from the air supply port 3, and the entire inside of the rotating month 9 was always maintained in an excess air atmosphere.

[0292] The composition of the fired product obtained by this combustion treatment was examined by X-ray diffraction. As a result, it did not contain a hard high-temperature sintered product (goulenite) and contained in paper sludge before the combustion treatment. All calcium carbonate was changed to calcium oxide. In addition to the components other than calcium carbonate, the force talc, in which all kaolin was changed to calcined kaolin, did not change at all.

[0293] Next! /, The fired product obtained by the above-mentioned combustion treatment is mixed with 60 ° C hot water using a suspension tank (dissolving tank), and the temperature of the suspension tank is adjusted to 60 ° C. While maintaining the temperature at 60 ° C., the mixture was stirred for 60 minutes to prepare a calcined product suspension having a solid content concentration of about 12%. Then, 10 kg of this calcined product suspension was charged into a carbonation reaction tank, and while maintaining the temperature of this carbonation reaction tank at 60 ° C, 20 liters of 25% by volume carbon dioxide-containing gas was added to the suspension. Carbonation was carried out by stirring for 60 minutes while blowing at / min. As a result of examining the composition of the inorganic particles after the carbonation treatment by X-ray diffraction, the total amount of calcium oxide produced / combusted by the combustion treatment was converted to calcium carbonate.

[0294] Next, the suspension of the carbonated product obtained by the carbonation treatment was dehydrated with a filter press, and the cake-like carbonated product having a solid content concentration of about 48% was obtained. A white inorganic particle slurry having a solid content of about 46% was prepared by dispersing in water using a core mixer. In addition, in this water to be dispersed, a polyacrylic acid-based dispersant (trade name: ALON T 50, manufactured by Toa Gosei Co., Ltd.) as a dispersant is 1.0 wt. Per 100 parts by weight of the solid content of the carbonized product. Part was added. Finally, the above-mentioned inorganic particle slurry was wet-ground using a sand grinder to obtain fine white inorganic particles suitable for a coating pigment.

[0295] Example 18

Except that the sludge temperature in the one-fire combustion zone Z1 in the combustion process was set to 450 ° C, White inorganic particles were obtained in the same manner as in Example 1.

[0296] Example 19

White inorganic particles were obtained in the same manner as in Example 1 except that the raw paper sludge was granulated and formed into pellets having a diameter of about 15 mm and a length of about 15 mm.

[0297] Example 20

Except for adding about 0.01 part of sodium hydroxide to 100 parts of sludge solids by adding sodium hydroxide to the papermaking sludge before drying treatment, the same as in Example 1 above. White inorganic particles were obtained.

[0298] Example 21

By adding sodium hydroxide to the paper sludge before drying, about 1 part of sodium hydroxide is added to 100 parts of sludge solids, and the primary combustion zone Z1 and secondary in the combustion process are added. White inorganic particles were obtained in the same manner as in Example 1 except that each treatment time in the combustion zone Z2 was shortened to 30 minutes and 70 minutes, respectively.

[0299] Comparative Example 5

Example 1 of the previous example except that the sludge temperature in the seven-fired combustion zone Z1 and the secondary combustion zone Z2 in the combustion treatment was both set to 600 ° C and the whole combustion treatment was made one stage (130 minutes as the combustion treatment time). In the same manner, white inorganic particles were obtained.

[0300] Comparative Example 6

Example 1 above except that the sludge temperature in the seven-fired combustion zone Z1 and the secondary combustion zone Z2 in the combustion process is 700 ° C, and the entire combustion process is in one stage (130 minutes as the combustion process time). In the same manner, white inorganic particles were obtained.

[0301] Comparative Example 7

Example 1 of the previous example except that the sludge temperature in the seven-fired combustion zone Z1 and the secondary combustion zone Z2 in the combustion treatment was both set to 800 ° C and the whole combustion treatment was made one stage (130 minutes as the combustion treatment time). In the same manner, white inorganic particles were obtained.

[0302] Comparative Example 8

Except for the fact that the sludge temperature in the seven-fired combustion zone Z1 and the secondary combustion zone Z2 in the combustion process was both set to 900 ° C, and the entire combustion process was made one stage (combustion treatment time 130 minutes), White inorganic particles were obtained in the same manner as in Example 1.

[0303] Comparative Example 9

White inorganic particles were obtained in the same manner as in Example 1 except that the sludge temperature in the seven-fire combustion zone Z1 in the combustion treatment was 200 ° C.

[0304] Comparative Example 10

White inorganic particles were obtained in the same manner as in Example 1 except that the sludge temperature in the one-fire combustion zone Z1 in the combustion treatment was 660 ° C.

[0305] Comparative Example 11

In the combustion process, the seven-fire combustion process and the secondary combustion process are performed separately using two rotary kiln furnaces, and in the seven-fire combustion process, air supply to the rotary drum of the rotary kiln furnace is stopped and poor. White inorganic particles were obtained in the same manner as in Example 1 except that the combustion treatment (carbonization treatment) was performed in an oxygen atmosphere.

[0306] Reference Example 8

White inorganic particles were obtained in the same manner as in Example 1 except that the raw paper sludge was granulated and formed into pellets having a diameter of about 1 mm and a length of about 5 mm.

[0307] Reference Example 9

White inorganic particles were obtained in the same manner as in Example 1 except that the raw paper sludge was granulated and formed into pellets having a diameter of about 30 mm and a length of about 30 mm.

[0308] For the above examples, comparative examples and reference examples, the whiteness of the fired product obtained in the 17th combustion process of the combustion treatment, the whiteness of the fired product obtained in the secondary combustion process, and the presence of unburned carbides. The results obtained by examining the whiteness of the inorganic particles finally obtained, the presence or absence of the hard sintered material, and the overall evaluation are shown in Table 5 below together with the respective treatment conditions. The measurement and evaluation of each item are as follows.

[0309] [Whiteness]

After grinding about 10g of the fired product from the combustion process until there are no coarse particles in the mortar, press for 30 seconds at a pressure of lOOkN using a powder tableting machine (type Cat9302 / 30 manufactured by RIKEN ELECTRIC CO., LTD.). Molded. Next, the whiteness of this molded sample was measured in accordance with JIS P8148 (2001) using a spectral whiteness colorimeter (SC-10WT model manufactured by Suga Test Instruments Co., Ltd.). did.

[0310] [Presence of unburned carbide]

In the measurement of the whiteness, the power for crushing the fired product, the remaining state of the unburned carbide before grinding of the fired product was visually observed and evaluated in the following three stages.

○ · · · There is no unburned carbide on the inside and outside of the fired particles

△ · · · Unburned carbides remain inside the burnt particles

X · · · Unburned carbides remain in the inner and outer parts of the fired particles [0311] [Presence of hard sinter]

Coarse in a mortar! / Inorganic particle sample ground until no particles exist! /, Using an X-ray diffractometer (M03XHF already described), 40KV, 20mA, diffraction angle measurement range: up to 50 degrees To determine the presence or absence of a hard sintered product (goulenite). “None” of this hard sintered product is excellent in quality, and “Yes” is inferior in quality.

[0312] [Comprehensive evaluation]

Regarding the inorganic particles of the sample, the quality as a papermaking material was comprehensively evaluated in the following three stages from the data on the whiteness and presence / absence of a hard sintered product. The whiteness is less than 78% at the stage of inorganic particles finally obtained.

〇 ··· Does not include hard sintered products with sufficiently high whiteness

△ · · · Whiteness is slightly low, but does not contain hard sintered material

X · · · One or both of insufficient whiteness or hard sintered material

[0313] [Table 5]

ooooo ^ t ⁴ _

^ <] <] Reference examples

X X Additive additive 〇 NHa X X o) (Grain size radius mm mm o

? s

℃ temperature o o

o Floor process combustion)

X

Condition and evaluation is village

<X o

<z>

1? § <] Degree temperature radis

o

X

^ 门 Air supply to

X X

Burned or unburned

? 1! 〇〇

■

<o

¾ 〇〇

o

t-with or without hard sinter

? § ^ 〇〇

o

¾ ¾ 〇〇

>

oo

○ ○ a

■ HQ. u § X

¾

From the results of 1 i i s 5, the paper production sludge used as a raw material Since the machine particles undergo a two-step firing process under specific conditions, they have high whiteness and do not contain hard sintered products, and can be reused sufficiently as papermaking materials such as coating pigments and papermaking fillers. It is clear that it has good quality. On the other hand, inorganic particles obtained through a one-step firing process at various temperatures (Comparative Examples 5 to 8), inorganic particles obtained through a firing process in which the heat treatment temperature of the primary firing process is too low or too high in two stages (Comparative Examples 9 and 10) In inorganic particles obtained through the firing process in which the primary firing process in two stages is performed in an oxygen-poor atmosphere (Comparative Example 11), the whiteness is low, or the hard particles are included, It is difficult to use as a papermaking material. In addition, if the granulated material of the papermaking sludge as the raw material is too small (Reference Example 8) or conversely too large (Reference Example 9), the quality of the resulting inorganic particles is poor. It is also suggested.

[0315] [Calcium carbonate decomposition rate after combustion treatment]

Next, as an evaluation other than the items listed in Table 5, for each example, the decomposition rate of calcium carbonate after the combustion treatment was determined in the following steps i) to vi). The amount of calcium and residual calcium carbonate in the calcined sludge was determined and evaluated. As a result, no calcium carbonate peak was observed in the X-ray diffraction measurements of all the examples, and all the calcium carbonate in the sludge fired product was decomposed in the combustion treatment process. For this reason, the amount of calcium carbonate (A) in the sludge calcined product in all examples obtained based on the following procedure is 0. (^ (0% by mass) per lg of sludge calcined product. In all the examples obtained from the above, the decomposition rate of calcium carbonate after the combustion treatment was 100%.

[0316] i) Preparation of calcite calcium carbonate calibration curve

Calcium carbonate with a crystal structure of calcite (Tamapearl 222H manufactured by Okutama Kogyo Co., Ltd.), zinc oxide (special grade reagent manufactured by Kishida Chemical Co., Ltd.) as an internal standard substance, weight ratio of 1: 5, 1: 1, 5: 1 Each was mixed. Next, after each mixture was thoroughly ground using a mortar, it was measured using an X-ray diffractometer (M03XHF manufactured by Max Science) under the conditions of 40 KV, 20 mA, and a diffraction angle measurement range of 5 to 50 degrees. Based on the X-ray diffraction 100% peak areas of calcium calcite and zinc oxide, a calibration curve for calcite calcium carbonate was prepared. [0317] ii) Preparation of calibration curve for aragonite calcium carbonate

[0318] iii) Determination of calcium carbonate in paper sludge before combustion treatment

Weighed zinc oxide (reagent special grade described above) was added to the weighed absolute dry papermaking sludge and mixed. Next, the mixture was sufficiently ground using a mortar, and then measured using an X-ray diffractometer (M03XHF described above) under conditions of 40 KV, 20 mA, and a diffraction angle measurement range of 5 to 50 degrees. Calcium X-ray diffraction 100% peak area of calcium calcite and aragonite calcium with respect to zinc was calculated, and the amount of calcium carbonate (g) contained in the papermaking sludge lg was calculated based on the calibration curve of each calcium carbonate described above. Calculated.

[0319] iv) Measurement of ash content in paper sludge

The weighed absolute dry papermaking sludge was burned using a pine furnace to the same conditions as the rotary kiln furnace in the examples, and the weight of the resulting sludge fired product was weighed. Was used to measure the ash content (%) of the sludge.

[0320] V) Quantification of calcium carbonate in calcined sludge

[0321] vi) Decomposition rate of calcium carbonate after combustion treatment

Calcium carbonate decomposition rate (%) = 100— [AX (C / 100)] ÷ BX 100 [Presence / absence of unregenerated calcium carbonate]

Furthermore, as an evaluation other than the items listed in Table 1, for the inorganic particles finally obtained in each example, an inorganic particle sample ground in a mortar until no coarse particles disappeared was used as an X-ray diffraction apparatus (M03XHF). Was used under the conditions of 40 KV, 20 mA, and a diffraction angle measurement range of 5 to 50 degrees, and the presence or absence of calcium oxide and calcium hydroxide as unregenerated calcium carbonate was examined. As a result, it was found that the inorganic particles of all the examples did not contain calcium carbonate unregenerated, and all were excellent in quality.

[0323] Further, as another embodiment of the present invention, the invention according to claims 28 to 44 proposes a method for producing inorganic particles according to the present invention and a rotary kiln furnace employed in a production plant. . This embodiment is illustrated in FIGS.

[0324] The invention of claims 28 to 44 according to another embodiment of the present invention is a continuous type or batch type rotary kiln that includes a rotary drum inside and heats / fires the raw material charged in the rotary drum. The present invention relates to a furnace and a heat treatment apparatus including the kiln furnace. As raw materials, sludge, particularly papermaking sludge having suitability as a pigment for coated paper or a filler for papermaking, is preferably used.

[0325] A rotary kiln furnace (also referred to as a rotary kiln) is a device that supplies raw materials into a rotary drum (also referred to as a furnace core tube or firing chamber), and heats, dries, and fires the raw materials. This rotary kiln furnace has a generally cylindrical shape of force S, and the raw materials charged in the rotary drum for heating and firing are stacked and deposited on the lower bottom of the rotary drum. Since it is difficult to mix, the raw materials have problems such as a problem that the raw material cannot be uniformly heated and fired, and a problem that the heat cannot be sufficiently fired.

[0326] In response to uneven heating and firing treatment of raw materials in the rotary kiln furnace as described above and insufficient problems, various methods for stirring the raw materials can be used in the kiln rotary drum. Patent Documents 21, 22, and 23 introduce a method of stirring the raw material in the rotating drum by providing a so-called “one”. Further, Patent Document 24 introduces a method of stirring a raw material in a rotary drum by introducing a movable stirring blade into the rotary drum of the kiln. Also, Patent Document 25 introduces a method for making the entire cross-sectional shape of the kiln's rotating drum different from a circular shape such as an ellipse or a triangle. In addition, as a variety of methods to reduce the stacking of raw materials put into the kiln's rotating drum, it is rotated by a partition-like straight plate so that the sectional shape of the rotating drum is divided into three, four, six, etc. Patent Documents 26, 27 and 28 introduce a method of partitioning the inside of the trunk. Patent Documents 29 and 30 introduce a method of introducing a plurality of small cylindrical tubes into the rotary cylinder of the kiln to make the rotary cylinder into a multi-cylinder type.

Patent Literature 21:: Japanese Utility Model Publication No. 53--077944

Patent Document 22:: Japanese Utility Model Publication 56--03398

Patent Document 23:: Japanese Patent Laid-Open No. 59-193123

Patent Document 24:: JP-A-2005-281069

Patent Document 25:: Japanese Patent Laid-Open No. 2003-120910

Patent Document 26:: Japanese Utility Model Publication No. 49-021223

Patent Document 27:: Japanese Patent Laid-Open No. 2001-311583

Patent Document 28:: Japanese Patent No. 89181

Patent Document 29:: Japanese Utility Model Publication No. 52-Ό80046

Patent document 30:: JP-A-03-95389

[0328] As described above, various stirring methods for uniformly heating the raw materials have been proposed to improve the heating and firing conditions of the rotary kiln furnace. Although the raw materials can be heated uniformly by internal stirring, the raw materials are stacked and deposited on the lower bottom of the rotary drum of the kiln. Such a state is shown in FIG. FIG. 25 is a cross-sectional view of a rotary drum as an example of a conventionally used rotary kiln furnace. It can be seen that the raw material particles Sa, Sa '"are accumulated in the bottom left corner. The reason why the raw material particles are unevenly distributed is that the raw material particles Sa, Sa' '' are introduced into the rotary cylinder 24. This is because the raw material particles Sa and Sa— are stacked and deposited due to the large amount of the generated material, and in addition, the rotating cylinder 24 rotates in the direction of arrow C. When raw materials containing organic components are heated and fired, air (oxygen) for burning the organic components does not reach the raw materials at the bottom of the laminated / deposited layers, causing incomplete combustion and unburned carbon. There was a problem that only heated and fired products with low whiteness were obtained.

[0329] In addition, as described above, in the heating and baking process of the raw material containing the organic component, the raw material Since incomplete combustion occurs due to the lamination of the materials, in order to obtain a high-quality white-heated and fired processed material, the amount of raw materials input into the rotary kiln of the kiln is greatly reduced. However, when a large amount of raw material is required to be processed, an extremely large kiln facility is required.

[0330] In the present invention, when a raw material is heated and fired by a rotary kiln furnace, incomplete combustion due to excessive layering of the raw material is prevented, and sufficient and uniform heating and firing treatment can be performed. The objective is to be able to heat and bake many raw materials.

[0331] A rotary kiln furnace according to claim 28 of the present invention is a rotary kiln furnace provided with a rotary drum inside and firing raw materials introduced from one side, wherein the rotary drum has a plurality of rotary kilns therein. A multi-partitioned partition structure provided with compartments each having at least two or more compartments in the radial direction of the rotating drum, the compartments of the outermost layer region and the compartments of the central region in the radial direction of the rotary drum It is a rotary kiln furnace with at least one structure.

[0332] Furthermore, the multi-partition partition structure according to claim 29 includes at least one compartment (eg, 150cl) constituting the central compartment (CS), and the outermost compartment compartment. This is a multi-partition partition structure that is configured to have a set of compartments (150Α, 150Β ···) with a certain shape, consisting of at least two or more compartments (eg 150ol and 150o2) that make up (OS) This is preferable for the efficient introduction of raw materials to each compartment (see Fig. 16 (a) and (b)).

[0333] In addition, the cross section of the multi-partition partition wall structure portion according to claim 30 has a substantially regular hexagonal outline, and the substantially regular hexagonal outline is defined as a sectional shape that divides the inside of the substantially regular hexagonal outline. Divide the inside of the approximately regular hexagon into six approximately regular triangular compartments (six divisions-abbreviated as the regular triangular compartment) by the straight line connecting the center of the square and each of the six vertices. The six divisions-regular triangular compartment has three straight lines that connect the approximate center of gravity of the substantially regular triangle and the approximate midpoints of the three sides, respectively. By dividing the substantially regular triangle into three substantially congruent quadrangular compartments, the partition structure is divided into 18 compartments as a total number of partitions. (Referred to as the structural part) is preferable for introducing the raw materials efficiently and evenly into each compartment.

[0334] Further, the cross section of the multi-partition partition wall structure portion according to claim 31 has a substantially regular hexagonal outline. As a cross-sectional shape that divides the inside of the outline of the substantially regular hexagon, the inside of the substantially regular hexagon is divided into six substantially regular triangles by a straight line connecting the center of the substantially regular hexagon and each of the six vertices. Divided into compartments (six divisions-regular triangle type compartments), and three straight lines connecting the approximate midpoints of each side of the regular triangles of the six divisions-regular triangle type compartments By dividing the roughly regular triangle of the 6-split type-triangular type compartment into four roughly congruent triangle compartments, the total number of divisions is divided into 24 compartments. It is a cross section, and this partition wall structure part (referred to as a 24 divided A-type multi-partition partition wall structure part) is also preferable in efficiently introducing the raw material into each compartment.

[0335] In addition, the cross section of the multi-partition partition wall structure portion according to Claim 32 has a substantially regular hexagonal outer shape, and the cross sectional shape that divides the inside of the substantially regular hexagonal outer shape is substantially regular 6 Divide the inside of the approximately regular hexagon into six approximately regular triangular compartments (six divisions-abbreviated as the regular triangular compartment) by the straight line connecting the center of the square and each of the six vertices. The six-divided-regular triangular compartment is divided into three substantially regular triangles and three hexagons, and one hexagon, which is divided into four compartments. Is divided into compartments so that each corner of the regular triangular shape of the 6-divided-regular triangular compartment occupies each corner of the regular triangular shape, so that the total number of divisions is divided into 24 compartments. This partition structure (referred to as the 24 partition B type multi-partition partition structure) is also used to efficiently and uniformly introduce raw materials into each compartment. preferable.

[0336] In addition, the cross section of the multi-partition partition wall structure portion according to Claim 33 has a substantially regular hexagonal outline, and the substantially regular hexagonal outline is defined as a sectional shape dividing the inside of the substantially regular hexagonal outline. Divide the inside of the approximately regular hexagon into 6 approximately regular triangular compartments (six divisions-abbreviated as the regular triangular compartment) by a straight line connecting the center of the square and each of the six vertices. The six-divided-regular triangular section chamber is divided into three substantially congruent triangles and three generally congruent rhombuses so as to be divided into six compartments. Dividing into compartments so that each of the roughly congruent rhombuses occupies each corner of the six-divided-regular triangular compartment, each of which is divided into 36 compartments in total. This partition structure part (referred to as 36-partition multi-partition partition structure part) is also used to efficiently and uniformly introduce raw materials into each compartment. preferable. [0337] Further, the rotating drum according to claim 34 is a rotating drum further including a small-divided partition wall structure portion having a single-layered compartment group on the side of the raw material in the multi-divided partition wall structure portion. That is, it is preferable to connect the small-divided partition wall structure portion in front of the multi-divided partition wall structure portion in order to introduce the raw materials efficiently and evenly into the compartments of each multi-divided partition wall structure portion.

[0338] In addition, the section of one compartment of the subdivided partition wall structure according to Claim 35 is configured to have substantially the same cross-sectional shape as the outline of the set of compartments of the uniform shape. This is preferable for efficiently and evenly introducing raw materials to each compartment.

[0339] The subdivided partition wall structure portion according to claim 36 has a substantially regular hexagonal outline substantially the same as the multi-partition partition wall structure portion, and the inside of the substantially regular hexagonal outline is inside. As a cross-sectional shape to be divided, a straight line connecting the center of the substantially regular hexagon and each of the six vertices, the interior of the substantially regular hexagon is divided into six generally regular triangular compartments (six-segmented-triangular section) It is preferable that the raw material is efficiently and evenly introduced into each of the compartments of the multi-partition partition structure.

[0340] In addition, the rotating drum according to claim 37 is provided with a second subdivided partition wall structure portion and a second multi-partition partition wall structure portion on a side opposite to the raw material charging direction of the multi-partition partition wall structure portion. In order to introduce raw materials efficiently and evenly into the respective compartments of the multi-partition partition wall structure, it is preferable that the rotary drum further includes one or more pairs in combination.

[0341] Further, it is preferable that the plate material constituting the divided partition wall structure portion according to claim 38 is a perforated metal plate.

[0342] Further, there is provided heating means for heating the rotary drum from the inside, surrounded by a group of compartments in a central region of the rotary kiln furnace provided with the multi-partition partition wall structure according to claim 39. It is possible to uniformly heat the raw materials introduced into the respective compartments of the multi-partition partition wall structure, and to provide a heating- It is preferable for improving the firing efficiency. Further, in order to provide the cavity inside the rotating drum, it is necessary to arrange a tubular member so as to penetrate at least the rotating drum and to make the tube wall a part of the partition wall of the multi-partition partition wall structure. Also good for communication!

[0343] The heat treatment apparatus according to claim 40 of the present invention is configured to transfer the rotary kiln furnace to the rotary kiln furnace. As an air introduction means, a heat treatment apparatus further comprising an exhaust means around one end of the rotary kiln furnace on the raw material supply port side. Furthermore, it is preferable that a heating means for indirectly heating and baking the supplied raw material according to claim 41 is provided. Furthermore, the heating means according to claim 42 is provided, and the first heating means is a heating means for heating from the outside of the rotary drum constituting the rotary month of the rotary kiln furnace, and the second heating means. That the means is a heating means for heating from the cavity inside the rotary drum inside the rotary drum, the raw material introduced divided into each compartment of the divided partition wall structure portion is uniformly heated and heated. It is preferable for improving the firing efficiency. Furthermore, it is preferable that the rotary kiln furnace according to claim 43 further comprises means for granulating the supplied raw material so that the diameter or length of the raw material is 2 to 30 mm. It is preferable that the raw material feed paper sludge supplied to the rotary kiln furnace according to claim 44.

[0344] With the configuration as described above, in addition to increasing the heat transfer area, the raw materials are unloaded and distributed over the entire compartment to the central region and the outermost layer region of the rotating drum cross section. By effectively using the cross-section, the stacking height of the raw material in the rotating drum is greatly reduced, and air (oxygen) is easily distributed in the raw material, thereby preventing incomplete combustion of the raw material. It is intended to obtain a high-quality, heat-treated product with high whiteness with little residual unburned carbon, and to be able to process many raw materials in a rotary kiln furnace.

[0345] In addition to providing the multi-partition partition structure on the rotary drum of the kiln, the method of indirectly heating and firing the rotary drum by the external heating method, the direction opposite to the raw material traveling direction in the rotary drum In combination, the method of introducing air in the direction and the method of granulating and forming the raw material to be put into the rotating drum can be used to efficiently heat and sinter even raw materials containing organic components. It is intended to make it possible to obtain high-quality, high-quality heat-fired products.

[0346] According to the embodiment of the present invention, when the raw material is heated and baked by a rotary kiln furnace, incomplete combustion due to excessive stacking of the raw materials can be prevented, and sufficient and uniform heating and baking can be performed. In addition, many raw materials could be heated and fired efficiently.

[0347] The inventors of the present invention have been introduced into the rotary drum of the kiln described in the patent literature as described above. Various methods of dividing the inside of the rotating cylinder into multiple cylinders and multiple chambers to reduce the stacking / deposition of the raw materials were tried and studied. Although these methods can reduce the stacking of raw materials somewhat by dividing the chamber into multiple chambers in the rotating drum, it is not sufficient to increase the heat transfer area and reduce the stacking of raw materials by the divided partition wall structure. In particular, it was found that the raw material could not be easily lifted to the center and upper part of the rotating drum section. This state is shown in Figs. FIG. 26 is a conceptual diagram showing a stacked state of raw materials in an example in which a six-partitioned partition wall structure part 140 is simply used for the rotating drum. In Fig. 26, it can be seen that the raw material particles Sa, Sa- are deposited to some extent in each compartment, the force S existing in each compartment 130ο 1, 130ο2, · '· 130ο6. In addition, the raw material particles Sa and Sa '"are unevenly distributed to some extent in each compartment. The reason why the raw material particles Sa and Sa'" are unevenly distributed as described above is that, as mentioned above, Since the raw material particles Sa, Sa '"are introduced in large quantities, the raw material particles Sa, Sa' ... are stacked. In addition to the deposition, the partition wall structure 140 rotates in the direction of arrow C. Yes, it was found that if the stacking of raw material particles Sa and Sa '"increases to some extent, incomplete combustion occurs, there are many unburned carbon (soot), and only a heated and calcined product with low whiteness can be obtained. .

An attempt was made to improve the raw material particles Sa and Sa '··· as shown in Fig. 26 to some extent. For this reason, we have devised a multi-partition partition structure with multiple compartments that divides one compartment into more compartments. An example is shown in FIG. FIG. 27 is a conceptual diagram showing a raw material lamination state in an example in which an 18-divided multi-divided partition wall structure portion 160 is simply used for the rotating drum. In this way, by making the compartments exist in two layers in the radial direction, such as the compartment group (OS) in the outermost layer region and the compartment chamber group (CS) in the central region, a rotary cylinder having the same diameter can be obtained. We thought that the deposition state of raw material particles Sa, Sa '... could be improved. However, even when such a multi-partition partition structure having double compartments in the radial direction is used, the raw material particles Sa, as shown in FIG. OS) (see Figure 16 (a) for the compartment corresponding to the example in Figure 27)

150ol of the outermost compartment in the city

, 150ο2, · '· 150ο12), it was found to be unevenly distributed. [0349] In order to improve the uneven distribution of such raw material particles Sa, Sa '· ·, we considered the following two measures to introduce the raw materials almost uniformly into each compartment of the same month.

(1) Method to devise raw material introduction means to the compartment of the multi-partition partition structure

(2) Method of using the small partition wall structure part in combination with the multiple partition wall structure part as described above

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The block diagram of an example of the heat processing apparatus provided with the rotary kiln furnace of this invention was shown. FIG. 13 is a configuration diagram of a heat treatment apparatus including the rotary kiln furnace 1 of the present invention. This heat treatment equipment is also called a continuous treatment type / indirect heating type (external heating type) rotary kiln. In FIG. 13, the raw material S containing organic components (for example, papermaking sludge) is dehydrated or dried by a drying device (not shown) and then installed at one end of the rotary drum 9 of the rotary kiln furnace 1. The raw material is fed into the raw material supply port 2 (for example, supply hot bar) and supplied into the rotary drum 9 of the rotary kiln furnace 1 via the raw material introduction means 10 (for example, screw feeder) into the rotary drum 9. . Next, the raw material S supplied into the rotary drum 9 is heated and baked after the organic components contained are burned while passing through the rotary drum 9 and the organic components are removed by combustion. It is taken out of the rotary kiln furnace 1 through the heating / fired material discharge port 8 installed at the end opposite to the raw material supply port 2 of the barrel 9 and, if necessary, heated / fired. It is sent to the next process for processing such as grinding.

In the present invention, the raw material S containing an organic component is heated and baked to obtain a high-quality white and high-temperature heated and baked product, and then into the rotary drum 9 of the rotary kiln furnace 1. It is indispensable to introduce air and burn organic components contained in the raw material S. Therefore, exhaust means 4 (eg exhaust fan) is installed in the vicinity of the raw material supply port 2, and this exhaust means 4 forcibly exhausts the air in the rotary kiln furnace 1, thereby heating and firing processed material discharge port. Air is sucked into the rotary kiln furnace 1 from the air supply port 3 installed in the vicinity of 8 as indicated by an arrow A. In this way, the air flow indicated by the dashed arrow A always occurs from the air supply port 3 toward the exhaust means 4. This air flow becomes an air flow A for conveying unburned matter, which will be described later. This air amount is controlled by controlling the exhaust amount of the exhaust fan. This amount of air is excessive so that the inside of the rotary drum 9 of the rotary kiln furnace 1 is in an oxygen-rich atmosphere. The power is preferably controlled to be inhaled. The direction of air introduction is the direction indicated by the broken arrow A (opposite to the countercurrent direction), which is opposite to the direction indicated by the arrow B where the raw material is continuously supplied into the rotary drum 9 of the rotary kiln furnace 1 and proceeds. ) Is configured to introduce air from. This is because, when the raw material S containing organic components is burned, unburned material such as soot is generated, but at this time, the same direction as the direction of arrow B in which the raw material S travels (cocurrent direction). When the air is introduced, the soot generated by the combustion of the raw materials on the introduced air moves in the direction of the heating / fired product discharge port 8, and the firing is completed and whitened. This is not desirable because it reduces the whiteness by attaching soot to the surface, but in contrast to this, the direction indicated by the broken arrow A (the arrow A through which the air flows) is opposite to the direction indicated by the arrow B in which the raw material S moves. When air is introduced in the direction shown (counterflow direction), soot generated by the combustion of the raw material moves on the introduced air and moves in the direction of the raw material inlet 2 in the rotary drum 9, and is newly added to the rotary drum 9. The power to burn again with the raw material S input to Stage 4 is discharged out of the rotary kiln furnace 1 and the whiteness can be efficiently improved without fouling being attached to the heated / baked product outlet 8 that is discharged from the heated / baked product discharge port 8. This is because it is preferable.

[0352] As a method of introducing the air flow indicated by the broken line arrow A into the rotary drum 9 of the rotary kiln furnace 1, the pressurized air is heated and the air installed in the vicinity of the calcined product discharge port 8 is used. Can be blown from supply port 3. As shown in FIG. 13 described above, the heating / calcined product discharge port is obtained by forcibly exhausting the air in the rotary drum 9 by the exhaust means 4 installed in the vicinity of the raw material supply port 2. A method is preferred in which air is sucked into the rotary moon 9 from the air supply port 3 installed in the vicinity of 8. This is because air has a low density and is easy to be compressed. Therefore, if the air is introduced into the rotary cylinder 9 filled with the raw material S by air pressure from the air supply port 3, the rotary cylinder 9 of the rotary kiln furnace 1 is long. Although it is difficult for air to reach the entire interior, the air inside the rotary drum 9 is forcibly exhausted by the exhaust means 4 provided on the opposite side of the air supply port 3 to make the pressure inside the rotary drum 9 negative. The air flow indicated by the arrow A from the supply port 3 to the exhaust means 4 direction is always generated in a stable manner, so that the air can be easily distributed to the raw material S in the rotary drum 9. It is.

[0353] In the present invention, the rotary kiln furnace 1 is controlled by forced exhaustion by the exhaust means 4 described above. The amount of air supplied into the rotary drum 9 is an excess amount of oxygen relative to the amount of oxygen (theoretical oxygen amount) required to completely burn off the organic components contained in the raw material S. The amount of air supplied to the rotary drum 9 that is preferably set to the amount of air supplied (excess oxygen atmosphere) is 1. 1.! Magashi 1. A power of 5 to 5 times is more preferable, and 2 to 5 times is particularly preferable. If the amount of air supplied into the rotary drum 9 is less than 1.1 times the amount of oxygen (theoretical air amount), the combustion of the organic components contained in the raw material S will be incomplete, and the heating / firing process This is not preferable because the whiteness of the object may be lowered. On the other hand, if the amount of air exceeds 5 times the theoretical air volume, the temperature in the rotary drum 9 will be excessively cooled by the supplied air. On the other hand, it is necessary to increase the heating by the heating means 5 in order to maintain the temperature in the rotary drum 9, which is not preferable in terms of energy cost.

In the present invention, an internal heating type heating-firing method may be used as a heating and firing method for the rotary kiln furnace 1, but as shown in FIG. The heat to be heated is mainly supplied from the indirect heating means 5 and is preferably an external heating type heating method in which the raw material S is indirectly heated (fired). This is because the introduction of a large amount of air is indispensable for burning raw materials containing organic components.In the internal heat type, the air inside the kiln furnace 1 (oxygen) is rotated to burn the heating burner. In the case of the external heating type, the raw material S is heated from the outside of the rotating drum 9 by the indirect heating means 5 and air containing a large amount of oxygen is separately supplied from the air supply port 3 to the inside of the rotating drum 9. Therefore, it is preferable to make the raw material S stable and easy to burn. In addition, when it is necessary to control the temperature at which the raw material S is heated and fired, in the internal heating type, the temperature in the vicinity of the heating burner inevitably becomes high, and the temperature in the rotary drum 9 becomes uneven in temperature, causing heating. 'Because it is difficult to control the firing temperature to a certain desired temperature, the temperature of the entire rotary cylinder 9 tends to be non-uniform, but in the case of external heating, indirect heating provided at various locations outside the rotary cylinder 9 This is preferable because the temperature inside the rotary drum 9 can be stably controlled using a plurality of burners of the means 5. As this indirect heating means, electrical heating is possible, but heating with a combustion gas of kerosene or heavy oil or heating with a gas burner is economically preferable. In addition, the indirect heating means described above includes combustion exhausted from existing incineration equipment. Exhaust gas can be used, and water vapor or the like can also be used. Further, in the example shown in FIG. 13, a circulation blower which is an example of the hot air circulation means 7 is used to perform a pre-process (drying) of the heat treatment apparatus provided with the rotary kiln furnace 1 of the present invention as shown in FIG. The combustion exhaust gas from the process, the primary firing step, etc.) can also be supplied as an indirect heating means.

[0355] A method of using the above-described (2) small-partition partition structure part in combination with the above-described multi-partition partition structure part was applied to the inside of the rotary drum 9 of the rotary kiln furnace 1 described above. An example will be explained using Fig. 14 and below.

FIG. 14 is a configuration diagram for explaining the structure of the rotary kiln furnace 1 in the heat treatment apparatus shown in FIG. In the figure, description of components having the same reference numerals as those in FIG. 13 is omitted. As shown in FIG. 14, the rotary drum 9a in the rotary kiln furnace 1 has a multi-partitioned partition structure 120 and its front side, that is, the raw material supply direction side of the multi-partition partition structure 120, in other words, the raw material supply of the rotary drum 9a. Mainly constructed by connecting the small partition structure 110 to the side of the mouth 2! /. In the figure, the multi-divided partition wall structure portion 120 and the subsequent parts are constituted by an outer cylindrical portion 8a having the same shape as the multi-divided partition wall structure portion 120.

[0357] Hereinafter, the multi-partition partition wall structure 120 of the present invention will be described. The multi-partition partition structure part 120 is basically divided into a plurality of compartments, and each compartment communicates from the raw material entrance side to the exit side of the multi-partition partition structure part 120. In order to efficiently use the cross section of the rotary drum 9a, a compartment is provided so as to be multilayered in the radial direction (radial direction) of the rotary drum 9a. Particularly preferably, it is composed of two compartments, that is, a group of compartments of two regions, an outermost layer region and a central region. In other words, the multi-partition partition wall structure 120 has a compartment composed of multiple compartments, that is, two or more compartments in the radial direction (radial direction) of the rotation month 9a. When such a multi-layered compartment is provided, it is preferable to divide into 15 or more compartments in order to uniformly heat the raw materials. As a typical example of such a multi-partition partition structure 120, four examples of 18-partition type, 24-partition A-type, 24-part harm IJB type, and 36-partition type will be described below.

[0358] [Explanation of 18-partition multi-partition partition structure]

FIG. 16 shows a / 3— / 3 ′ cross section in FIG. 14 when an 18-divided multi-partition partition structure part is used as the multi-partition partition structure part 120 in the rotary drum 9a shown in FIG. Figure 16 FIG. 15 is a β-cross-sectional view when an example of a multi-partition partition structure part (18-partition type multi-partition partition structure part) provided with 18 compartments provided in the rotary drum 9a shown in FIG. a) is a sectional view showing each compartment, and (b) is a sectional view showing each compartment set. As shown in Fig. 16 (a), each of the compartments 150ol, 150 ο2,. Each compartment to be made up of 150cl, 150c2---15006 power. This is the partial force S18 split type multi-partition partition structure 160 that constitutes the partition walls and outer walls between these compartments. This 18-partitioned multi-partition partition structure 160 is shown in Fig. 16 (b).

As shown in the figure, the cross section of the 18-divided multi-divided partition wall structure 160 has a substantially regular hexagonal outline, and the center of the substantially regular hexagon as a shape that divides the inside of the substantially regular hexagonal outline. By a straight line connecting the point and each of the six vertices, the inside of the approximately regular hexagon is divided into six approximately regular triangular compartments 150Α, 150Β, * · · 150Ρ (six-segmented-triangle-shaped compartment) To be divided). Fig. 16 (b)

As shown in Fig. 3, for example, the compartment set 150A is taken as an example by three straight lines that connect the approximate center of gravity of the roughly regular triangle of the compartment set 150A and the approximate midpoints of the three sides. The compartment set 150A is divided into three substantially congruent quadrangular compartments 150cl, 150ol, and 150o2. In this way, at least one compartment that constitutes the central compartment (CS), in this example 150cl, and at least two compartments that constitute the outermost compartment (OS), in this example An 18-partition multi-partition partition structure in which a fixed shape composed of 150ol and 150o2, in this example, an approximately regular triangular shape of a set of compartments 150Α ···, is provided with a total of 18 compartments It is preferable to constitute the part 160. The reason for this will be explained later. The example shown in this figure is an example of the most preferable structure portion as the 18-divided multi-divided partition wall structure portion. That is, the sectional areas of the compartments are substantially the same, and the partition walls constituting the multi-partition partition structure are configured linearly and symmetrically, so this multi-partition partition structure is combined with a metal plate or the like. Easy to make.

Here, the shape of the multi-partition partition structure and each compartment is abbreviated to mean that there may be a slight deviation from a strict regular triangle or regular hexagon. For example, when the tubular member is arranged in the center as described later, each compartment of the compartment group in the central region Is not a triangle, but includes such a case. Note that the fact that the sectional areas of the compartments are substantially the same indicates that uniform heating and firing can be performed with little bias in the stacked and deposited state. In addition, the compartments in the outermost layer area (o

If the partition wall structure is formed so that it is composed of two compartments, S) and the central compartment (CS), the sections shown in Fig. 16 (a) It is also possible to deform the cross section of the chamber into a polygon, a curve, a circle, or a combination thereof. However, the shape shown in FIG. 16 (a) is preferable for the uniform heating as described above and the ease of manufacturing the device. In the following, the power to explain the 24-split type and 36-split type is the same as the concept of the shape of each compartment, and the explanation is omitted.

[Explanation of 24-part A type multi-partition partition structure]

Fig. 17 shows the / 3— / 3 'cross section in Fig. 14 when a 24-divided A-type multi-divided wall structure is used as the multi-divided partition wall structure 120 in the rotary drum 9a shown in Fig. 14. It was. Fig. 17 is a 13-cross-sectional view when using an example of a multi-partition partition structure (24-part A-type multi-partition partition structure) with 24 compartments provided in the rotary drum 9a shown in Figure 14 (A) is a cross-sectional view showing each compartment, (b) is a cross-sectional view showing each compartment set. As shown in Fig. 17 (a), each of the compartments 170ol, 170ο2. · '170ο18 that make up the compartment (OS) in the outermost layer and the compartment (CS) in the central region Each compartment is composed of 170cl, 1 70c2---17006. The partition between these compartments and the part that constitutes the outer wall is a 24-part A-type multi-partition structure 180. As shown in FIG. 17 (b), the 24-divided A-type multi-divided partition wall structure 180 has a substantially regular hexagonal cross section as shown in FIG. As a shape that divides the inside of the outline of the approximately regular hexagon, the interior of the approximately regular hexagon is divided into six approximately regular triangles by a straight line connecting the center of the approximately regular hexagon and the six vertices. , 170mm, ······················ 170F (6 divisions-abbreviated as a regular triangular compartment). Furthermore, as shown in Fig. 17 (b), taking the compartment set 170A as an example, three straight lines connecting the approximate midpoints of the sides of the substantially regular triangle of the compartment set 170A, The compartment chamber set 170A is divided into four substantially congruent triangular compartments 170cl, 170ol, 170o2 and 170o3. In this way, at least the compartment (CS) of the central area One compartment, in this example 170cl, and a fixed shape consisting of at least two compartments that make up the outermost compartment (OS), in this example 170ol, 170o2, and 170o3, In this example, it is preferable to configure a 24-divided A-type multi-divided partition wall structure portion 180 in which a plurality of substantially regular triangular partition chamber assemblies 170 Α ··· are gathered to provide a total of 24 partition chambers. The reason for this will be explained later. The example shown in this figure is an example of the most preferable structure part as a 24 division type multi-partition partition structure part. That is, the sectional areas of the compartments are substantially the same, and the partition walls constituting the multi-partition partition structure are configured linearly and symmetrically. Therefore, the multi-partition partition structure is combined with a metal plate or the like. Easy to manufacture [Explanation of 24-part B-type multi-partition partition structure]

Fig. 18 shows the / 3— / 3 'cross section in Fig. 14 when a 24-divided B-type multi-divided wall structure is used as the multi-divided partition wall structure 120 in the rotary drum 9a shown in Fig. 14. It was. Fig. 18 shows / 3— / when using an example of a multi-partition partition structure part (24-part B-type multi-partition partition structure part) provided with 24 compartments provided in the rotary drum 9a shown in FIG. 3 'is a cross-sectional view, (a) is a cross-sectional view showing each compartment, (b) is a cross-sectional view showing each compartment set. As shown in Fig. 18 (a), each of the compartments that make up the compartment (OS) in the outermost layer area is divided into roughly regular triangular compartments 190ο1, 190ο2 · '· 190ο12, and hexagons. It consists of type compartments 190ο13, 190ο14 ···· 190ο18, and respective compartments 190cl, 190c2---19006 that constitute the central compartment (CS). The part that constitutes the partition walls and outer walls between these compartments is the 24-part B-type multi-partition structure 200. As shown in FIG. 18 (b), the 24-divided B-type multi-divided partition wall structure portion 20 has a substantially hexagonal outer cross section as shown in FIG. As a shape that divides the inside of the outer shape of the approximately regular hexagon, the interior of the approximately regular hexagon is divided into six substantially regular triangular compartments by a straight line connecting the center of the approximately regular hexagon and each of the six vertices. , 190Β ··· '190F (6 divisions-abbreviated as a regular triangular compartment). Furthermore, as shown in FIG. 18 (b), for example, in the case of the compartment set 190A, the substantially regular triangle of the compartment set 190A is divided into three substantially congruent triangles 190cl, 190ol, and 190o2. Divided into 4 compartments by hexagon 190ol3, and the three roughly congruent regular triangles 190cl and 190ol, 190o2 are divided into each of the roughly regular triangles of compartment chamber set 190A. Divide it to occupy each corner! In this way, at least one compartment constituting the central compartment (CS), 190cl in this example, and at least two compartments constituting the outermost compartment (OS), in this example In this example, a regular shape composed of 190ol, 190ο 2 and hexagonal compartments 190ο13, and in this example, a set of compartments 190 略It is preferable to constitute a 24-divided vertical multi-divided partition wall structure 200 provided with 24 compartments. The reason for this will be explained later. The example shown in this figure is an example of the most preferable structure part as a 24 division type multi-partition partition structure part. That is, the cross sections of the equilateral triangles and hexagonal compartments in each compartment set are substantially the same, and the partition walls constituting the multi-partition partition structure are configured linearly and symmetrically! /, Therefore, it is easy when the multi-partition partition structure is manufactured by combining metal plates or the like.

[Explanation of 36-partition multi-partition partition structure]

FIG. 19 shows a / 3— / 3 ′ cross section in FIG. 14 in the case where a 36-divided multi-partition partition structure part is used as the multi-partition partition structure part 120 in the rotary drum 9a shown in FIG. Fig. 19 shows a cross-sectional view of a 13-section using an example of a multi-partition partition structure with 36 compartments (36-part multi-partition structure) provided in the rotary drum 9a shown in Fig. 14 (A) is a sectional view showing each compartment, (b) is a sectional view showing each compartment set. As shown in Fig. 19 (a), each of the compartments that make up the compartment (OS) in the outermost layer area is divided into roughly regular triangular compartments 210ol, 210ο2, ··· 210ο6, and rhombus Section rooms 210ο7, 210ο8, · '· 210ο18, and each compartment that constitutes the section room group (MS) in the middle layer area is a substantially triangular type compartment 210ml, 210m2, "' 2100! 12 Each of the compartments that make up the compartment (CS) in the central area is composed of diamond-shaped compartments 210cl, 210c2, ··· 21 (^ 6. The part constituting the partition walls and outer walls between these compartments is the 36-partitioned multi-partition partition structure part 22. This 36-partition type multi-partition partition structure part 220 is shown in FIG. As shown in (b), the cross section of the 36-divided multi-divided partition wall structure 22 has a substantially regular hexagonal outline, and a shape that divides the interior of the substantially regular hexagonal outline. As a result, a straight line connecting the center of the approximately regular hexagon and the six vertices, the interior of the approximately regular hexagon is divided into six substantially regular triangular compartments 210Α, 210Β, Corner (It is abbreviated as a shape compartment). Further, as shown in FIG. 19b, taking the compartment set 210A as an example, the substantially regular triangle of the compartment set 210A is divided into three substantially congruent triangles 210m1, 210m2, and 210ol. Divided into approximately six concentric rhombuses 210cl, 210o7, 210o8 and divided into 6 compartments. Are divided so as to occupy each. In this way, at least one compartment constituting the compartment (CS) in the central region, in this example, the diamond-shaped compartment 210cl, the compartment constituting the compartment (MS) in the middle region, in this example A substantially regular triangular compartment 210ml, 210m2, and at least two compartments that make up the outermost compartment (OS), in this example, a substantially triangular compartment 210ol and a diamond compartment A constant shape composed of 210o7 and 210o8, in this example, a substantially regular triangular partition room set 210Α ... It is preferable to constitute the structure part 220. The reason for this will be explained later. The example shown in the figure is an example of the most preferable structure as the 36-partition multi-partition partition structure. That is, the sectional area of each of the regular triangular and rhombus compartments in each compartment set is substantially the same, and the partition walls constituting the multi-partition partition structure are configured linearly and symmetrically. This is easy when the multi-partition partition structure is manufactured by combining metal plates or the like.

[0363] In the above-described 36-divided multi-divided partition wall structure 220, the substantially congruent rhomboid compartments constituting the outermost layer region (OS) and the center region (CS) are further divided into two substantially congruent positives. By dividing into three square-type compartments, all compartments are roughly congruent and regular triangle-type compartments, and a 54-partition multi-partition partition structure with a total of 54 compartments (Fig. Multi-partitioned partition wall structure with 54 or more compartments as the total number of partitions by applying the concept of the 18-, 24-, and 36-partitions described above. It is also possible to do this.

[0364] Of the various multi-partition partition structures described above, the heat transfer effect on the heating and firing process of the raw material is improved, and the uniform introduction of the raw material into each of the divided compartments is relatively easy. Stacking of raw materials in the cylinder 'Multi-divided partition wall structure that can greatly reduce the deposition state is the 18-segment type (160), 24-division A-type (180), 24-division B-type (200), and 36 4 types of multi-partition partition structure typical of the split type (220) are preferred. Among these 4 types of multi-partition partition structure, stacking of raw materials in a rotating cylinder with the largest number of divisions in the compartment The 36-divided multi-divided partition wall structure (220) is particularly preferable. In the case of a multi-divided partition wall structure section having a total number of division chambers exceeding 36 as in the case of the above-mentioned 54-divided multi-divided partition wall structure section, theoretically, the heat transfer of the raw materials to the firing process is carried out. This is effective because the effect is improved and the stacking / deposition state of the raw materials can be greatly reduced. On the other hand, the structure of the multi-partition partition structure is complicated in practical use, and this multi-partition partition structure is manufactured. In addition, the number of divided compartments becomes too large, and it becomes extremely difficult to introduce the raw materials to all the divided compartments sufficiently evenly. As a result, the stacking-deposition state of the raw materials is sufficient. There is a risk that it cannot be alleviated.

[0365] In the multi-partition partition wall structure 120 described above, the number of compartments dividing the inside of the kiln's rotary drum 9a (cross section / 3− / 3 ′) is set to 15 or more, so that it was introduced into the rotary drum 9a. Since the raw material S can be widely distributed in the cross section of the rotary drum 9a, it is possible to sufficiently reduce the stacking of the raw material S and prevent the heated and fired product from being incompletely fired. Particularly preferred.

[0366] In the case where the rotating drum is constituted only by the multi-partition partition structure described above, the uneven distribution of the raw material particles Sa and Sa '"occurs as described above with reference to Fig. 27. In order to prevent this, as described above, (1) A method of devising the raw material introduction means into the compartment of the multi-partition partition structure, that is, the raw material introduction means such as a screw feeder that has been used conventionally is replaced with another raw material introduction means, And (2) a method in which the small partition wall structure is used in combination with the multi-partition wall structure as described above.

[0367] Among these, (1) a method for devising the means for introducing the raw material into the compartment of the multi-partition partition structure will be described below. As shown in FIG. 30, the raw material particles Sa and Sa '''introduced into the rotating drum by the raw material introducing means such as a screw feeder are further divided into the central region of the dividing partition wall structure 120. Introducing the raw material into the compartment 25, for example, using the introduction pipe in the figure. FIG. 30 is a conceptual diagram of an example in which an introduction pipe is used as an example of the raw material introduction means 25 to the multi-partition partition structure 120 in the rotating drum. Besides the introduction pipe, A slider can be used as well. Similarly, the raw material introduction means 26 into the compartments in the outermost layer region is also introduced into each compartment of the multi-partition partition structure 120 using an introduction pipe. The raw material introduction means 25 (not shown in FIG. 30) such as an independent screw feeder are connected to the raw material introduction means 25 in the central region and the raw material introduction means 26 in the outermost layer region, respectively. Control the introduction amount of raw material particles Sa and Sa '''by changing the diameter of each raw material introduction means 25 and 26, and control the introduction amount of each raw material in the central region and the outermost layer region. Raw material particles Sa, Sa-... can be introduced.

[0368] (2) As a method of using the small-partition partition structure part in combination with the above-described multi-partition partition structure part, as shown in FIG. A small-divided partition wall structure 110 is connected to the direction side, and by rotating the rotating drum 9a including the small-divided partition wall structure 110, the raw material S is uniformly distributed, natural, In addition, this is a method that can be automatically entered. By combining this small-divided partition wall structure section 110 with the multi-divided partition wall structure section 120, the principle that the raw material S is uniformly and automatically introduced into each compartment of the multi-divided partition wall structure section 120 will be described in detail below. As described above, as a method of introducing the raw material into each compartment of the multi-partition partition structure 120 in the rotary drum 9a, the above-described (1) means for introducing the raw material into the compartment of the multi-partition partition structure is used. Compared with the method, this (2) method of using the small partition wall structure part 110 in combination with the multi-partition wall structure part 120 does not require the introduction of special machinery for the introduction of raw materials. The principle is more preferable because it is very simple.

[0369] This small-divided partition wall structure 110 is, as described above, "multi-divided partition having a compartment composed of multiple compartments, that is, two or more compartments in the radial direction (radial direction) of the rotating drum 9a. Unlike the “wall structure 120”, the “small partition wall structure 110 having a compartment composed of a single layer, that is, only one layer, in the radial direction (radial direction) of the rotating drum 9a”. The rotary cylinder 9a shown in FIG. 14 uses the 18-partitioned multi-partition structure 160 described above as the multi-partition structure 120 as the multi-partition structure 120, and the six-partition structure 110 as shown in FIG. 15 as the sub-partition structure 110. FIG. 15 shows an α-section in FIG. 14 when the mold with the multi-divided partition structure 140 is used. FIG. 15 is a cross-sectional view in the radial direction of an example of a six-partition small partition structure. [0370] As can be seen from Fig. 15, if the compartment is called the outermost layer region, it is composed of the single-layer compartments 130ο1, 130ο2 * · 130ο6 that constitute the compartment (OS) of the area that can be called. It has been. As shown in FIG. 15, the α — cross section of the subdivided partition wall structure 110 has a substantially regular hexagonal outline, and as a shape that divides the inside of the substantially regular hexagonal outline, The inside of the approximately regular hexagon is divided into six approximately regular triangular compartments 130οί, 130ο2 · '· 130ο6 (abbreviated as 6 divisions-regular triangular compartment) by a straight line connecting the heart and each of the six apexes. It is divided into.

[0371] The multi-partition partition structure 120 described above is provided in the rotary drum 9a of the kiln, and the multi-partition partition structure unit 110 is connected to the raw material input direction side of the multi-partition partition structure 120. Therefore, the reason why the raw material S is uniformly, naturally and automatically charged into each compartment of the multi-partition partition structure 120 is due to the following mechanism.

[0372] Usually, as shown in FIG. 25, when the rotary cylinder 9a of the kiln has no partition wall structure, or as shown in FIG. 26, the subdivided partition wall structure 110 is singly inside the rotary cylinder 9a of the kiln. When provided (for example, the 6-partitioned small partition wall structure 140), the charged raw material particles Sa, Sa '*' are separated from the rotary cylinder 24 or the small partition wall structure 140, each compartment 130ol, 130o2. ---13 0o6 is simply laminated on the bottom of the bottom, and there is a lot of free space in the rotary cylinder 24 or in each compartment 130ο1, 130ο2 · '· 130ο6 of the small partition wall structure 140, and it rotates sufficiently. The space in the cross section of the trunk 9a cannot be used effectively.

In addition, as shown in FIG. 27, when the multi-partition partition structure 120 is provided alone in the kiln rotary cylinder 9a (for example, the 18-part multi-partition partition structure 160), The raw material particles Sa, Sa '· · · are the compartments constituting the compartment (OS) of the outermost layer of the compartments of the 18-partition multi-partition partition structure 160 (in Fig. 16 (a), 150ol, 150o2, 1 50o3 ... 150ol8), each of the compartments constituting the compartment (CS) in the central region of the 18-partition multi-partition partition structure 160 (in FIG. 16 (a), 150cl, 150c2---1500 6) Since the raw material particles Sa, Sa '"are not introduced, the space in the cross section of the rotary cylinder 9a cannot be fully utilized.

[0374] On the other hand, as a result of intensive research, the inventors provided a multi-partition partition structure 120 in the rotary drum 9a of the kiln as shown in FIG. The raw material S is divided into sections by connecting the small partition wall structure 110 on the raw material input direction side. Could be introduced evenly into the room. The state is shown in Figs. Fig. 28 shows the raw material particles Sa, Sa 'in each compartment of the 1 / 8-divided multi-divided partition structure 160 when the 6-divided sub-divided partition structure 140 and 18-divided multi-divided partition structure 160 are connected. It is a conceptual diagram showing a stacked state of. Fig. 29 shows the raw material particles Sa and Sa in the compartments of the 36-partitioned multi-partition structure 220 when the 6-partition subpartition structure 140 and the 36-partition multipartition structure 220 are connected. It is a conceptual diagram which shows the lamination | stacking state of "". As shown in FIGS. 28 and 29, each of the compartments of the multi-partition partition structure 120 having a cross-sectional structure such as an 18-part multi-part structure 160 and a 36-part multi-part structure 220 as the cross-section structure The raw material particles Sa, Sa-... are introduced evenly, but the compartments that make up the compartment (CS) in the central region of the multi-partition partition structure that had previously been difficult to introduce (for example, 18 compartments) In the multi-divided partition wall structure 160, the compartments 150cl, 150c2 · '· 150.6, and 36 in the split-type multi-partition wall structure 220 in FIG. : 210c2 · '· 210ο 6) and the compartments that make up the compartments (MS) in the middle layer area (for example, in the 36-partitioned partition structure 220, in Fig. 19 (a) Division chamber 210ml, 210m2 · ·-210ml 2) Raw material particles Sa, Sa '· can be transported and distributed, reducing the stacking state of raw materials On the other hand, it was found that the space of the cross section of the rotary drum 9a can be used very effectively. As an example of a mechanism for uniformly introducing the raw material particles Sa and Sa ′ ′ ′ into each compartment of the multi-partition partition structure 120, the sub-partition structure 110 shown in FIG. As shown in Fig. 6, the interior of the substantially regular hexagonal shell is divided into 6 sections, which are divided into approximately regular triangles (abbreviated as 6-divided-regular triangle sections). As shown in Fig. 26, the raw material particles Sa, Sa '*' introduced into the 6-split-regular triangular compartment, 130ol as an example, are rotated by one rotation in the rotation month 9a. As shown, the bottom of the compartment 130ol or the bottom base angle When the kiln's rotary drum 9a makes one rotation, the rotary drum 9a is heated in the direction of 7 ' It moves little by little, but at that time, the 18-segment type (160), 24-segment A type (180), 24-segment B type (200), And 36 minutes By combining one of the split-type (220) multi-partition partition structures, the raw material particles Sa, Sa move in the compartments 130ο1, 130ο2, · 130ο6 of the six-partition sub-partition structure 14 As shown in Figs. 28 and 29, while "" rotates once in the rotary drum 9a as the kiln rotates, the 18-split type (160), 24-split A type (180), 24-split B type (200 ), And the 36-partition (220) multi-partition partition structure section are uniformly and naturally introduced into the outermost layer region, the intermediate layer region, and the center region of the multi-partition partition structure portion. The raw material particles Sa, Sa ',' are transported to all compartments including the outermost layer region, the middle layer region, and the central region, and are evenly distributed.

[0376] As described above, the raw material S is transported from each compartment of the small partition structure 110 to each compartment of the multi-partition structure 120 and distributed uniformly. At least one of the 110 compartments that constitute the compartment (CS) in the central region of the multi-partition partition structure 120 and at least two compartments (OS) that constitute the outermost compartment (OS) Most preferably, it has the same cross section as a set of compartments of a certain shape constituted by compartments.

[0377] FIGS. 20 and 21 show examples of structures in which the above-described small-divided partition wall structure portion 110 and multi-partition partition wall structure portion 120 are combined. FIG. 20 is a partial sectional view showing an example of the structure of the rotary drum 9 in the rotary kiln furnace 1 shown in FIG. 13, and shows an example in which a plurality of multi-partition partition wall structure portions 120 are provided in the rotary drum 9b. As shown in FIG. 20, a plurality of divided partition wall structures 120 can be installed in the kiln's rotary drum 9b as required. Fig. 20 shows an example in which multi-partitioned partition wall structure 120 is provided at three locations in the front, middle and rear of the rotary drum.) Fig. 21 shows the structure of rotary drum 9 in rotary kiln furnace 1 shown in Fig. 13. It is a partial sectional view showing an example, and shows an example in which the multi-partitioned partition wall structure portion 120 is provided in the most area in the rotating month 9c. As shown in Fig. 21, after the small partition wall structure 110 is provided in the vicinity of the raw material supply port 2 of the rotary month 9c, it continues until the heating / fired product discharge port 8 of the rotary barrel 9c. Thus, by providing the multi-partition partition structure 120 in combination, almost the entire region of the rotation month 9c can be made into the multi-partition partition structure.

[0378] In addition, as shown in FIG. 20, when a plurality of structures in which the small partition wall structure portion 110 and the multiple partition wall structure portion 120 are combined are provided in the rotary drum 9b of the kiln, the small partition wall structure is used. The multi-partition partition structure 120 connected to the section 110 is a plurality of types of multi-partition partition structures. One type of multi-partition partition structure from 110 structures (for example, 18-part type (160), 24-part type A (180), 24-part type B (200), and 36-part type (220) Any one kind of force may be selected and used. However, two or more types of multi-partition partition structures (for example, 18-partition type (160 ), 24 split A type (180), 24 split B type (200), 36 split type (220) or more) Also good!

Further, as shown in FIG. 20 and FIG. 21, the length L1 of the small-divided partition wall structure portion 110 in the rotational barrel axis length direction of the present invention is such that the small-divided partition wall structure portion 110 stabilizes the raw material S. Since the raw material S needs to be stably and uniformly introduced into the multi-partition partition structure 120 that rotates while being held and is connected to the sub-partition structure 110 that follows the small-partition partition structure 110, 0.; 0 m is preferable, and 0.3 to 3. Om is particularly preferable. When the length L1 of the small partition wall structure part 110 in the longitudinal axis direction of the rotary cylinder is less than 0.1 lm, the raw material S into which the small partition wall structure part 110 is charged is held sufficiently stably and uniformly. It is not preferable because it is difficult to stir. If the length L1 of the small partition wall structure 110 in the longitudinal direction of the rotary cylinder exceeds 5. Om, the input raw materials are sufficiently stable in each compartment provided in the small partition wall structure 110. It is not preferable because it is held uniformly and wasted.

Yes

Further, as shown in FIG. 20 and FIG. 21, the length L2 of the multi-partition partition wall structure portion 120 of the present invention in the rotational barrel axis length direction is the time required for heating and firing the raw material S In the meantime, since it is necessary to hold the raw material S in the multi-partition partition wall structure 120, the thickness is preferably 0.3 to 50 m, and particularly preferably 0.5 to 30 m. When the length L2 of the multi-partition partition wall structure portion 120 in the rotational moon coaxial length direction is less than 0.3 m, it is preferable because it is difficult to secure the heating and firing time of the raw material S in the multi-partition partition wall structure portion 120. Absent. In addition, it is unlikely that the length L2 of the multi-partition partition wall structure portion 120 in the length direction of the rotary cylinder exceeds 50 m. If this length is sufficient, the input raw material S can be sufficiently heated and fired in the section of the multi-partition partition structure 120, so it is useless to make it longer. It is because it becomes.

[0381] Further, as illustrated in FIGS. 16 (a), 17 (a), 18 (a), and 19 (a), the multi-division in the present invention is performed. The size L3 of one side that constitutes the compartment provided in the bulkhead structure 120 is a substantially congruent triangular shape, which is determined based on the size (diameter) of the rotation month 9a, 9b, 9c of the kiln. Since it has a shape that is divided approximately evenly by a congruent quadrangle, a substantially congruent hexagon, a substantially congruent rhombus, etc., the size L3 of each side that basically constitutes each compartment is determined by the rotating cylinders 9a, 9b, Although it is determined depending on the size (diameter) of 9c, it is preferable that the size L3 of each side constituting each compartment of the multi-partition partition structure 120 is 15 mm or more. It is particularly preferable to set it to 50 mm or more. When the size L3 of each side constituting each compartment of the multi-partition partition structure 120 is less than 15 mm, when the raw material S is granulated, each compartment of the multi-partition partition structure 120 It is not preferable because the raw material S is difficult to be introduced into the wall and the size of the divided compartments is too small, making it difficult to process and manufacture the multi-partition partition wall structure 120.

[0382] In addition, it is preferable that the size L3 of one side constituting the compartment provided in the multi-partition partition wall structure 120 in the present invention is 2. Om or less, particularly 1.5m or less. Preferred. When the size L3 of each side constituting each compartment of the multi-partition partition structure 120 exceeds 2. Om, the kiln's rotating drum including the multi-partition partition structure 120 composed of each compartment 9a , 9b, 9c oversized by 8 mm, and the stacking of raw materials put into the rotary cylinders 9a, 9b, 9 c is sufficient. 2. Om or less (L3) is sufficient This is because it can be alleviated, and more than that is useless.

[0383] In the structure of the multi-partition partition wall structure 120 according to the present invention, the rotary cylinder of the kiln has 15 or more compartments inside thereof, and the compartments (OS) in the outermost layer region in the radial direction of the rotary drum. Figure 16a, Figure 17a, Figure 16a, Figure 17a, Figure As illustrated in Fig. 18a and Fig. 19a, characteristic structures such as the above-mentioned 18-divided type (160), 24-divided A-type (180), 24-divided B-type (200), and 36-divided type (220) Although it is particularly preferable if it has! /, As a method for forming the multi-partition partition wall structure 120, there is no particular limitation on the force that can use various methods. (160), 24-split A-type (180), 24-split B-type (200), and multi-split partition structure 120 such as 36-split type (220) Shows an example in Figure 22. 22 shows the multi-partition partition structure 120. FIG. 22 (a) is an exploded sectional view, and FIG. 22 (b) is after joining. Each cross-sectional view is shown. In this example, for the 18-divided multi-partition partition structure 160, each compartment that constitutes the multi-partition partition structure (for example, the outermost compartment compartments 150ο1, 150ο2 · '· 150ο12, and the central compartment compartment 150cl) , 150c2---15006), and then forming the desired multi-partition partition structure 120 (in this example, the 18-partition partition structure 160) by joining the compartments. I showed that I can do it. FIG. 23 shows an example of a method for forming the multi-partition partition structure by dividing the compartments by putting partitions inside the compartments. Fig. 23 shows an example of forming the multi-partitioned partition wall structure 120 by partitioning inside the compartment assembly and dividing it into compartments. Fig. 23 (a) is a cross-sectional view during assembly, and Fig. 23 (b) shows a sectional view after assembly. As shown in Fig. 23, the basic structure is the 6-divided subdivided partition wall structure 14, and the multi-partition for each of the compartments 130ο 1, 130ο2, · 130ο6 of the 6-divided subdivided partition structure 14 By introducing a partition (for example, 18-divided partition 23), a desired multi-divided partition wall structure 120 (as an example, 18-divided multi-partition partition structure 160) can be formed.

14, 20, and 21, the cross sections of the rotary drums 9 a, 9 b, and 9 c when the small partition wall structure part 110 and the multi-partition partition wall structure part 120 are provided in a portion that is not entirely within the rotary drum. The shape is the same as the cross-sectional shape of the outline of the small partition structure 110 and the multi-partition structure 120. For example, as shown in FIG. The cross-sectional shape of the outer shell is a substantially regular hexagonal six-partitioned subdivided partition wall structure 140, and the cross-sectional shape of the outer shell of the multi-partition partition wall structure 120 is also shown in FIGS. As shown in the examples, the cross-sectional shape of the outer shell is an approximately regular hexagonal 18-segment type (160), 24-divided A-type (180), 24-divided B-type (200), and 36-divided type (220 ) Of the multi-partition partition structure part 120, the cross-sectional shape of the outer shell of the rotary cylinders 9a, 9b, 9c is also the small-partition partition structure part 110, and the multi-partition partition structure part 120. It is particularly preferred to Guo sectional shape as well as substantially regular hexagonal shape. This is a force in which the outer cross-sectional shape of the small partition wall structure part 110 and the multi-partition wall structure part 120 has a substantially regular hexagonal shape. The cross-sectional shapes of the rotary cylinders 9a, 9b and 9c are also the small partition wall structure part. 110 and multi-partition partition structure 120 By using hexagons, the rotating cylinders 9a, 9b, 9c and the subdivided partition wall structure part 110 are connected to the rotating cylinders 9, 9a, 9b and the subdivided partition wall structure part 110, and the multi-partition partition wall structure part 120. , And the multi-partitioned partition wall structure 120 without any gaps, so that all the raw materials S introduced into the rotary drums 9a, 9b, 9c can be connected through the small-partitioned partition structure 110. This is because the partition wall structure 120 can be introduced into each compartment.

[0385] Fig. 31 is a configuration diagram of another example of a heat treatment apparatus including the rotary kiln furnace 1 of the present invention basically having the same configuration as Fig. 13 described above, and mainly includes components relating to the heating means. It is a block diagram to explain. Fig. 32 shows a cross section of the rotary drum of the same rotary kiln furnace. This example shows an 18-partitioned multi-partition partition structure (160). In this example, the configuration of FIG. 13 described above is partly changed to change the structure of the partition wall in the central region of the rotary drum 9 near the center of rotation of the divided chamber group, and a part of the partition wall in the center portion is changed. The tubular member 27 is constituted by the tube wall. The tubular member 27 is indicated by a solid line in FIG. 31 for easy understanding. Eventually, the inside of the tubular member 27 constitutes a rotary cylinder cavity V. By accommodating the second heating means 5b, which will be described later, in this cavity, a heat treatment apparatus provided with two types of heating means, the first heating means 5a and the second heating means 5b, in the rotary kiln furnace 1 is provided. It can be configured. Further, in this way, in order to provide the cavity inside the rotating drum, the tubular member 27 is disposed so as to penetrate at least the rotating drum, and the tube wall is made a part of the partition wall of the multi-partition partition wall structure. Is also preferable in terms of heat transfer from the second heating means to the compartments in the central region.

When the second heating means 5b is provided as illustrated in FIG. 31 as described above, the multi-partition partition wall structure portion having the outermost layer region compartment (OS) and the central region compartment (CS) is provided. When 120 is provided as the rotary drum 9 in the rotary kiln furnace 1 (rotary drum 9b in FIG. 33), it is sufficient and equal to the division chamber group (CS) in the central region of the multi-partition partition structure 120. It is possible to improve the heating and firing efficiency by applying heat. Furthermore, when it is required to precisely control the heating and firing temperature for the raw material introduced into each compartment of the multi-partition partition structure 120, it is provided on both the outer and inner sides of the rotary drum 9 respectively. The heating means 5a and 5b can control the heating and firing temperature uniformly and accurately, which is a more preferable embodiment.

[0387] After all, as a method of heating the rotating drum 9, the indirect (outside) heating means 5a as the first heating means described above, which is indirectly heated from the outside of the rotating drum 9, and the rotating drum 9 Inside It is very preferable to use both the indirect (inner side) heating means 5b as the second heating means to heat both the outer and inner forces of the rotary drum 9 together.

[0388] Fig. 33 shows a configuration diagram of another example in which the tubular member 27 for housing the heating means described above is provided in the rotary drum 9. In this example, as illustrated in FIG. 20 described above, the second heating means 5b is accommodated in a configuration using a combination of a plurality of sets of the small partition wall structure portion 110 and the multiple partition wall structure portion 120. FIG. 6 is a configuration diagram showing an example in which a tubular member 27 is applied for this purpose. In both FIG. 31 and FIG. 33, description of components having the same reference numerals as those in FIG. 13 is omitted. Also in this example, since the heating means can be provided in the tube of the tubular member 27, it is needless to say that the same effect as the example shown in FIG. 31 described above can be expected.

[0389] As the indirect (inner) heating means 5b provided in the tubular member 27, as in the indirect (outer) heating means 5a, electric heating, heating with a combustion gas of kerosene or heavy oil is performed. In addition to heating with a gas burner, various heating means such as heating with combustion gas discharged from existing incineration facilities and heating with water vapor can be used. In addition, as illustrated in FIG. 31, by using a circulating blower that is an example of the hot air circulating means 7, the pre-process (drying process) of the heat treatment apparatus provided with the rotary kiln furnace 1 of the present invention as shown in FIG. Combustion exhaust gas from the primary firing step etc.) can also be supplied as a heating means.

[0390] As for the inner cavity V of the rotating member 27 of the tubular member 27 that accommodates the heating means 5b for heating the rotating drum 9 from the inside, if the heating means 5b can be accommodated, the front and back of the cavity in the rotating drum 9 It is preferable for the reason described below that the closed space is closed.

[0391] That is, as described above, each compartment of the multi-partition partition wall structure 120 (for example, the compartments 150ο1, 150ο2 · 150ο12 in the outermost region of FIG. 32, and the compartments (150cl, 1 In order to improve the combustion efficiency of the raw materials introduced to 50c2 (150c6), it is necessary to introduce a large amount of air into each compartment, so air is introduced into the front and rear parts of the rotary drum 9. It is preferable that equipment, piping, etc. that obstruct the passage be placed as little as possible.

[0392] In particular, the exhaust side of the rotary drum 9, that is, the side provided with the exhaust means 4, les, les, and in other words, the raw material supply port 2 side of the rotary drum 9 and the vicinity of the rotary drum 9 originally cannot be a raw material input means such as a screw feeder. It is provided for avoidance. It is preferable to avoid further placement of such obstacles as much as possible. In this regard, when the electric heating means described above is used, the electricity supply path is relatively small and is not such an obstacle, which is preferable.

[0393] However, in view of economic efficiency as a heating means, it is more preferable to employ a heating means that uses a heating medium such as combustion exhaust gas. In such a case, the heating medium enters the rotary month inner cavity V of the tubular member 27 from the entrance, passes through the rotation month inner cavity V, transfers heat to the compartment in the central region, and exits from the outlet. It is necessary to take the configuration. If such a structure is simply considered, a structure having a heating medium supply pipe and a heating medium discharge pipe communicating with the cavity V in the rotating drum is obtained. That is, as the tubular member 27, a heating medium pipe penetrating from the intake side to the tubular member 27 exhaust side is provided so as to penetrate the central axis direction of the rotary kiln furnace.

[0394] The presence of such a through-pipe pipe, particularly on the exhaust side of the rotary drum 9 is not preferable because it becomes an obstacle for air introduction and passage as described above. As one measure, it is possible to reduce the degree of such obstacles by narrowing the heating medium pipe after exiting the cavity inside the rotating drum.

[0395] It is also possible to provide a heating medium pipe only on the intake side of the tubular member 27 in order to avoid such an air introduction and passage obstacle as much as possible. In this case, the heating medium pipe has a double structure. That is, a concentric double pipe structure or a simple parallel double pipe structure is connected to the cavity V in the rotating cylinder, and the heating medium supply pipe opens in the cavity V, particularly near the rotating cylinder 9. Further, there is a structure in which the heating medium is discharged and the heat-radiated medium is sucked into the heating medium discharge pipe opened at the center in the cavity. In addition, a so-called maze-like piping structure for efficient indirect heating, a fin structure for improving heat conduction, and the like can be appropriately combined and arranged in the hollow portion of the rotating drum.

[0396] In the above illustrated example, the tubular member 27 has been described as an example of a cylindrical shape and a hexagonal column shape. However, the cross-sectional shape of the tubular member 27 in the present invention is not particularly limited, A tubular member having a cross-sectional shape of any shape such as a substantially elliptical shape, a substantially polygonal shape that is substantially triangular or more, or a substantially star shape can be selected and used.

[0397] The tubular member 27 has a size (diameter) of 0.03 m or more, and a rotary kiln furnace 1 The diameter of the rotating cylinder 9 is preferably 0.34 times or less, and more preferably 0.1 lm or more and less than 0.1 times the diameter of the rotating cylinder.

[0398] In the case where the indirect (inner side) heating means 5b is provided inside the tubular member 27, if the diameter of the tubular member 27 is less than 0.03 m, the heating means 5b is provided inside the tubular member 27. On the other hand, when the diameter of the tubular member 27 exceeds 0.34 times the diameter of the rotary drum 9, it is divided into multiple sections so that the cross section of the rotary drum 9 is almost uniform. Among the compartments of the partition wall structure part 120, a part of the cross section of the compartment in the central region (for example, the compartments 150cl and 150c2---15006 shown in FIG. 32) is occupied by the tubular member 27, Since the cross-sectional area of the compartment in the central region is significantly reduced and the uniformity of the compartments of the multi-partition partition structure 120 is significantly disrupted, the raw material S in the compartment in the outermost region and the compartment in the central region Heating and firing may be uneven, and the center of the multi-partition partition structure 120 As a result of the reduction of the cross-sectional area of the area compartment (150cl, 150c2 '· 15 (^ 6 compartment shown in Fig. 32), the raw material S introduced into the central compartment This is because the stacking cannot be sufficiently reduced, and there is a possibility that the unburned carbon (soot) as a raw material may not be sufficiently removed by combustion.

[0399] Further, as the material of the rotary drum 9 provided in the rotary kiln furnace 1 in the present invention, that is, the material constituting the other parts such as the small partition wall structure part 110, the multiple partition wall structure part 120, the tubular member 27, etc. It is necessary to be made of a material that can withstand the heating and baking treatment, and a material that can withstand a temperature of about 1000 ° C. as the temperature during heating and baking is particularly preferable. In addition, when raw materials containing organic components are heated and baked, acidic and alkaline components may be generated. Therefore, it is highly preferred to be made of a material that can withstand acidic and alkaline properties. Steel materials with heat resistance and corrosion resistance such as

Yes

[0400] Further, the steel plate material constituting the small partition wall structure portion 110 and the multi-partition wall structure portion 120 in the present invention may be formed of the above-described metal plate such as stainless steel, but is further punched. It is preferable to comprise a perforated metal plate such as metal. This is because the perforated metal plate is used for the raw material S introduced into the compartments of the small partition wall structure part 110 and the multi-partition wall structure part 120 rather than the metal plate. Air (oxygen) is delivered to This is because it becomes easy to make it. There are various shapes and sizes of holes in this perforated metal plate

1S No particular limitation is imposed on the shape and size of the hole in the perforated metal plate used in the present invention. When the granulated raw material S is put into the rotary cylinder 9 of the kiln, the particles of the raw material S However, it is only necessary to use a perforated metal plate of various hole shapes such as round, triangle, quadrangle, slit shape, etc. it can.

[0401] In the present invention, the raw material S introduced into the rotary drum 9 of the rotary kiln furnace 1 reduces the stacking of the raw material S in the rotary drum 9 and improves the efficiency of contact with air (oxygen). For this reason, it is preferable to put into the rotary cylinder 9 after the granulation treatment (see FIG. 24). As a method of granulating the raw material S, a compression molding machine such as a briquetting machine, a roller compactor, a granulating machine such as a disk pelleter, or the like is used as a granulating and molding method. There are granulation method, rolling granulation method, stirring granulation method, extrusion molding method, etc., and as a method of granulating and forming into a particle size within a certain size range, it is large with screw feeder etc. In order to granulate and form the raw material S into a desired shape and size, the above-described granulation and molding method can be appropriately selected and used. In addition, the shape of the raw material S to be put into the kiln's rotary drum 9 is not particularly limited, and can be cylindrical, spherical, elliptical or triangular as long as it is within the size (diameter or length) range described below. It can be granulated and formed into other polygonal shapes, various particle shapes such as force, bowl shape, and uneven shape.

[0402] In the present invention, the size of the raw material particles Sa when granulated as described above is preferably a diameter or a length force of 2 to 30 mm, a force S, particularly preferably 5 to 15 mm. If the diameter or length of the raw material particles Sa when granulated is less than 2 mm, the raw material particles Sa, Sa in the rotary chamber 9 of the kiln or the compartment of the multi-partition partition structure 120 are used. -Stacking of raw material particles Sa, Sa-· · · Air (oxygen) does not spread in the layers, and the combustion of organic components contained in the raw material particles Sa becomes incomplete, heating. On the other hand, if the diameter or length exceeds 30 mm, the size of the raw material particles Sa is too large and is placed in the center of the raw material particles Sa. In the raw material particle Sa when air (oxygen) is difficult to reach Incomplete combustion may remain in the core, which may reduce the quality of the heated and baked product, and the raw material particles Sa travel through the rotary drum 9 and the compartment of the multi-partition partition structure 120. At this time, since the raw material particles Sa are too large, they may interfere with each other, and the raw material particles Sa may not be able to smoothly move through the compartments of the rotary drum 9 and the multi-partition partition structure 120, which is not preferable.

[0403] The rotary kiln furnace 1 according to the present invention is a power that can be used for heating and baking treatment of various raw materials regardless of the components such as organic components and inorganic components. It is particularly preferable to treat paper sludge discharged from a paper mill as such a raw material, which is particularly preferred to be used in the process of removing the organic component by burning and recovering the remaining white inorganic component. .

[0404] The heat treatment apparatus provided with the rotary kiln furnace 1 according to the present invention may be used alone as a heating and firing process apparatus to obtain a heated and fired processed product. However, as shown in FIG. After drying and granulation, a heat and calcined product may be obtained by performing a plurality of stages of heating and firing such as primary and secondary. FIG. 24 is an example of a flow sheet in which various treatment steps are added to the front and rear stages of the heat treatment apparatus of the present invention. In the figure, in the heat treatment apparatus of the present invention, the secondary firing process is shown. After obtaining the heated and fired product, further treatments for suspending, carbonating, dehydrating, dispersing, and pulverizing may be added as appropriate to obtain regenerated inorganic particles. These various processing steps are used by appropriately adding or omitting them depending on the raw materials and the object to be obtained.

[0405] [Evaluation]

As described above, according to the present invention, in the rotary drum 9 of the rotary kiln furnace 1, the outermost layer compartment chamber (OC) and the central compartment chamber (CS) in the radial direction of the rotor barrel. The ability to significantly reduce the stacking of the raw material S in the rotary drum 9 by providing at least one multi-partition partition structure 120 having a plurality of compartments composed of at least two compartments. This makes it possible to greatly improve the heat transfer efficiency and the contact efficiency between the raw materials for burning organic components and air, so that there is no residual unburned carbon and excellent whiteness. In addition to being able to obtain a fired and fired product, more raw materials can be efficiently heated and fired even in a rotary kiln furnace with the same outer diameter. Can do.

[0406] Further, according to some aspects of the present invention, the outermost layer compartment (OS) and the central compartment chamber in the rotary drum 9 of the rotary kiln furnace 1 in the radial direction of the rotary drum. (CS) At least one multi-partition partition structure part 120 provided with a plurality of compartments composed of a group of compartments of at least two layers is provided, and further on the raw material supply port 2 side of the multi-partition partition structure part 120 By connecting the small partition wall structure part 110 having a single-layered partition room group with less than 15 compartments in the rotation month 9, a raw material S is provided in each compartment of the multi-partition wall structure part 120. Therefore, it is possible to use the movement of the raw material particles Sa, Sa '· that move while rotating in the small partition wall structure 1 10 by the rotation of the rotating drum 9 without introducing special equipment. The raw material is uniformly, naturally and automatically in each compartment of the multi-partition partition structure 120 following the sub-partition structure 110 By introducing the raw material particles Sa, Sa ′..., The raw material particles Sa, Sa ′.

[0407] Further, a tubular member 27 for housing the heating means is provided in the center of the rotary drum 9, and the second heating means is indirectly (inner side) inside the rotary cylinder cavity V of the tubular member 27. ) By providing the heating means 5b, the heat transfer efficiency can be improved and the heating and firing efficiency of the raw materials can be improved.

[0408] Next, as still another embodiment of the present invention, the invention according to claims 45 to 61 can be cited, and another method employed in the method for producing inorganic particles and the production plant according to the present invention. A rotary kiln furnace is proposed. This embodiment is illustrated in FIGS. 34-58.

Yes

[0409] The inventions according to claims 45 to 61 according to other embodiments of the present invention, like the rotary kiln furnace described above, include a rotary moon inside and heat the raw material charged into the rotary drum. The present invention relates to a continuous or batch rotary kiln furnace to be fired and a heat treatment apparatus equipped with the kiln furnace. As the raw material, sludge, in particular, papermaking sludge having suitability as a pigment for coated paper or a filler for papermaking is preferably used.

[0410] In the above-described rotary kiln furnace, as the prior art, Patent Document 2 described above;

[0411] As explained in the above-mentioned rotary kiln furnace, the heating kiln in the rotary kiln furnace For the improvement, various stirring methods for heating the raw material evenly have been proposed. In these methods, although the raw material can be heated evenly by stirring inside the rotary drum, the raw material is kiln. Laminate and deposit on the bottom of the rotating drum. Such a state is illustrated in FIG. 34 and FIG. Among these, FIG. 34 is a cross-sectional view of a rotary drum 9 composed of a single substantially cylindrical tube portion as an example of a rotary drum of a rotary kiln conventionally used. FIG. 3 is a conceptual diagram showing a state in which particulate raw materials S and S ″ ′ are charged and stacked and deposited on the lower bottom portion of the rotary drum 9. FIG. 35 (a) shows an example of a conventionally used rotary kiln furnace in which a plurality of substantially cylindrical pipe portions 40, 40... Are bundled by a pipe portion fixing member 30a. FIG. 35 (b) is a cross-sectional view of the tube bundle, and FIG. 35 (b) shows the case where the particulate raw materials S and S ′ '' are introduced into the tubes 40, 40 of the tube bundle. 40 is a conceptual diagram showing a state of being stacked and deposited on the lower bottom portion of 40.

[0412] As illustrated in Fig. 34 and Fig. 35 (b), in a conventional rotary kiln furnace,

9 and the raw materials S and S '' 'charged into the pipe portions 40, 40 of the bundle of bundles are rotated to the left corner of the bottom bottom of each of the rotary drum 9 and the pipe portions 40, 40,. It can be seen that a lot is deposited. The reason why the raw materials S and S '"are unevenly distributed is that the raw materials S and S *' 'are injected into the rotary drum 9 or the pipe sections 40 and 40, ... This is because, in addition to the stacking / deposition of 3 * '', the tube bundle composed of the rotating drum 9 and the tube portions 40, 40... Is rotated in the direction of arrow C. When the raw materials containing organic components are heated and baked due to the lamination and deposition state of the raw materials S and S '", the organic components are burned up to the raw materials at the bottom of the laminated and deposited layers. There was a problem that incomplete combustion occurred without the air (oxygen) flowing through, and only a heated and calcined product with a low whiteness with a lot of unburned carbon (soot) was obtained.

[0413] Further, as described above, in the heating and baking process of the raw material containing the organic component, incomplete combustion occurs due to the lamination of the raw materials. To achieve this, the input of raw materials into the kiln's rotating drum is greatly reduced to suppress the stacking of raw materials. On the other hand, if a large amount of raw materials need to be processed, There were problems such as the need for kiln equipment. Papermaking sludge is an example of a material that is suitably used as a raw material containing such an organic component. [0414] Paper sludge is, as described, waste water that is also discharged from various processes of the paper mill. (1) Waste water generated during the washing process in the pulping process, (2) Removal of contaminants from the waste paper processing process, Wastewater generated in the deinking flotation process and washing process, (3) Wastewater that flowed out through papermaking wires as raw material loss during paper manufacture, and (4) Wastewater from biological wastewater treatment process The power that can be used for wastewater The sludge recovery process for these wastewaters is a combination of processes such as agglomeration, precipitation, concentration and dehydration, and the solids contained in each wastewater are recovered as sludge. The above-mentioned various wastewaters are individually sludge-recovered, and there is a case where various sludges such as deinking sludge, coated paper manufacturing sludge, and biological treatment surplus sludge may be recovered individually. The various process sludge discharged from the plant is generically called paper sludge. This paper sludge contains various components derived from paper mill wastewater.For example, lignin and fine fibers washed out in the pulping process, fiber such as pulp derived from raw material loss, starch and synthetic components. This includes organic substances mainly composed of synthetic adhesives, inorganic substances mainly composed of pigments and internal additives for coated paper, and printing inks derived from waste paper.

[0415] In the present invention, when a raw material is heated and fired by a rotary kiln furnace, incomplete combustion due to excessive stacking of the raw material is prevented, and sufficient and uniform heating and firing treatment can be performed. The objective is to be able to heat and bake many raw materials.

[0416] The rotary kiln furnace according to claim 45 of the present invention is a rotary kiln furnace provided with a rotary drum inside and firing raw material charged from one side, wherein the rotary drum has the raw material inside thereof. The plurality of tube portions are formed of a plurality of tube portions that pass therethrough, and the plurality of tube portions form a tube bundle that forms the outer peripheral portion of the rotating drum, and at the same time contain heating means for heating the rotating drum from the inside. It is a rotary kiln furnace which forms a hollow part in a rotary drum. In this case, it is preferable in terms of processing efficiency that the pipe parts come into direct or indirect contact with each other! /.

[0417] In addition, the rotary kiln furnace includes a rotating drum inside and fires the raw material charged from one side according to claim 46, wherein the rotating drum has a plurality of pipe member forces through which the raw material passes. The tube portion has at least one partition wall structure portion for multi-division for dividing the inside thereof into a plurality of compartments by a partition wall, and the plurality of tube portions further include the rotating cylinder. It is the rotary kiln furnace which forms the tube part bundle | flux which makes the outer peripheral part. [0418] In addition, the rotating cylinder according to Claim 47 is configured by a plurality of pipe parts through which raw materials pass, and the plurality of pipe parts are in direct or indirect contact with each other to perform the rotation. The tube section force in a rotary kiln furnace that forms a tube bundle that forms the outer periphery of the cylinder and at the same time forms a cavity in the rotary cylinder to accommodate heating means for heating the rotary cylinder from the inside, Having at least one multi-partition partition structure that divides the interior into multiple compartments by partition walls greatly reduces the stacking of the introduced raw materials and reduces the heating and firing efficiency of the raw materials. It is preferable for improving the ratio.

[0419] In addition, the multi-partition partition structure according to claim 48 has a plurality of partition walls radially provided from the substantially center of the cross section of the tube portion in a contour direction. It is preferable that the inside of the pipe part is divided into a plurality of compartments by walls and that the sectional shapes of the compartments are substantially the same in order to equally introduce the raw materials into the compartments.

[0420] Further, it is provided that the inner wall of the pipe portion according to claim 49 and / or the partition wall of the multi-partition partition wall structure portion is provided with a lifting plate (lifter 1) of the raw material introduced into the pipe portion. It is preferable for improving the stirring efficiency.

[0421] Further, the cross-sectional shape of the tube portion according to claim 50 is any one of a substantially circular shape, a substantially oval shape, or a substantially polygonal shape, so that the tube portion and the tube portion bundle are stably provided. It is preferable in constructing.

[0422] Further, the outer diameter of the pipe portion according to claim 51 is 1/8 to 1/2 of the cross-sectional outer diameter of the pipe portion bundle. This is preferable in order to achieve both heat and firing treatment amounts.

[0423] In addition, the pipe portion according to claim 52 is for multi-division for forming a multi-division partition wall structure non-portion, that is, a multi-division partition wall structure portion on the input direction side of the raw material of the multi-division partition wall structure portion. It is preferable to have the multi-partition partition structure part so that there is a portion where no partition or the like is inserted, in order to uniformly introduce the raw material into each compartment provided in the multi-partition partition structure part.

[0424] In addition, the pipe portion according to claim 53 has a second multi-divided partition wall structure portion non-part and a second multi-divided portion on the side opposite to the input direction of the raw material of the multi-divided partition wall structure portion. The multi-partition partition structure is a pipe part further including one or more sets of partition wall structure parts for use. This is preferable for efficiently introducing the raw material into each compartment of the section and improving the heating and firing efficiency of the raw material.

[0425] In addition, it is preferable that the multi-partition partition structure according to claim 54 is formed by inserting a driven rotary multi-partition partition member into the pipe part.

[0426] Further, it is preferable that the driven rotary multi-dividing partition member according to claim 55 has a structure including a damming member in the vicinity of the front end portion of the partition plate portion.

[0427] Furthermore, it is preferable that the plate material constituting the multi-partition partition wall structure portion according to claim 56 is a perforated metal plate.

[0428] Further, the heat treatment apparatus according to Claim 57 of the present invention further includes an exhaust means in the vicinity of one end of the rotary kiln furnace on the raw material supply port side as air introduction means to the rotary kiln furnace. It is preferable that it is a heat treatment apparatus.

[0429] Further, the heat treatment apparatus according to Claim 58 of the present invention preferably includes a heating means for indirectly heating and baking the raw material supplied to the rotating drum.

[0430] Further, the heating means according to claim 59 is provided, and the first heating means is a heating means for heating from the outside of the bundle of tube parts constituting the rotary drum of the rotary kiln furnace. The second heating means is a heating means for heating from the cavity inside the rotating drum inside the bundle of tube parts, and the raw material divided and introduced into each compartment of the multi-partition partition structure is uniformly distributed. It is preferable to improve the heating and firing efficiency.

[0431] Preferably, the raw material supplied to the rotary kiln furnace according to claim 60 is further provided with means for granulating and forming the raw material with a diameter or length of 2 to 30 mm.

[0432] Further, the raw material force S supplied to the rotary kiln furnace according to claim 61 and papermaking sludge are preferable.

[0433] With the configuration as described above, in addition to increasing the heat transfer area by using the rotating drum as the above-described tube bundle, heating is performed by heating both the outside and the inside of the tube bundle. -It is intended to improve the firing efficiency.

[0434] Further, the pipe part constituting the above-described pipe part bundle is provided with a multi-divided partition wall structure part constituted by a plurality of compartments, and a plurality of raw materials introduced by dividing into a plurality of pipe parts are further provided. By dividing it into separate compartments, the stacking height of the raw materials introduced into the rotating drum is greatly reduced. By making air (oxygen) easy to spread in the raw material, incomplete combustion of the raw material is prevented, and a high-quality, high-heated and fired fired product with little residual unburned carbon is obtained. And many raw materials can be processed by a heat treatment apparatus equipped with a rotary kiln furnace.

[0435] Further, in addition to the above-described configuration, a method of introducing air in a direction opposite to the raw material traveling direction in the rotating drum and a method of granulating and forming the raw material charged into the rotating drum are used. Thus, even a raw material containing an organic component can be efficiently heated and baked to obtain a high-quality heated and baked product with high whiteness.

[0436] According to the embodiment of the present invention, when the raw material is heated and fired in the rotary kiln furnace, incomplete combustion of the raw material is prevented, and sufficient and uniform heating and firing can be performed. Many raw materials could be heated and fired efficiently.

[0437] The inventors of the present invention described in the patent documents as described above, a method of heating the raw material put in the rotary drum of the kiln 'improving the firing efficiency, and reducing the stacking of raw materials' deposition. We tried and examined various methods to divide the inside of the rotating drum into multiple chambers.

[0438] Of these methods, the method of improving the heating and firing efficiency of raw materials increases the heat transfer area in the conventional method in which a plurality of cylindrical tube portions are provided in a rotating drum to form a tube portion bundle. Although it is possible to reduce the stacking of raw materials to some extent, it is difficult to heat uniformly only by heating from the outside of the tube bundle, especially when the number of tubes constituting the tube bundle is increased. Further, it has been found that it is difficult to uniformly heat each tube portion. In addition, regarding the method of reducing the stacking-deposition of raw materials, the conventional method in which a plurality of pipe portions are provided in the rotating drum to form a bundle of pipe portions increases the heat transfer area and stacks the raw materials. Although it can be somewhat reduced, it was found that the stacking and deposition of raw materials could not be greatly reduced, and it was difficult to improve the heating and firing efficiency. In addition, in order to improve the quality of the heat-fired product, if the number of pipes provided on the outer periphery of the rotating drum as a bundle of pipe parts is increased, the size of each pipe part (cylinder diameter) increases as the number of pipe parts increases ) Must be reduced, and the total volume of the pipe section in the rotating drum (so-called rotary kiln furnace processing volume) is reduced, so that it is possible to stack and deposit raw materials while maintaining the raw material throughput. It was found that it was difficult to sufficiently reduce [0439] This state is illustrated in FIG. Fig. 36 (a) shows the same size (outer diameter) of the tube bundle as compared to the tube bundle composed of the six tubes illustrated in Fig. 35. FIG. 35 (b) is a cross-sectional view of a tube section bundle in which the diameter of the tube section is smaller than that of FIG. 35 and 21 pipe sections more than FIG. 35 are bundled by the pipe section fixing member 30b. This is a conceptual diagram showing a state in which particulate raw materials S and S 'are put into the tube sections 40 and 40 of the bundle, and are stacked and deposited on the bottom bottom of the tube sections 40 and 40. is there. In Fig. 36 (b), the raw materials S, S ... are put into each pipe 40, 40 ..., but the raw materials S, S ... in each pipe 40, 40 ... It can be seen that there is some accumulation. In addition, the raw materials S and S '''are unevenly distributed to some extent within each pipe section 40 and 40. The reason for the uneven distribution of the raw materials S and S 'H is that, as mentioned above, the raw materials S and S *''are injected into the kiln's rotary drum because of the large amount of raw materials S and S *''. This is because the tube bundle as a rotating cylinder composed of the tube portions 40, 40,... Is rotated in the direction of the arrow C in addition to the stacking of S '''.

[0440] In this way, in a rotary kiln furnace with the same outer diameter of the rotary cylinder, the heat transfer area increases even if the number of pipe parts constituting the pipe bundle is increased by downsizing the pipe parts. Since the volume of the entire part (that is, the volume of the rotating drum) decreases, the amount of lamination of raw materials S and S '' 'increases, resulting in incomplete combustion and white with a lot of unburned carbon (soot) It was found that only low-temperature heating 'fired products were obtained! /, And! /.

[0441] As a result of repeated trials on the method for improving the incomplete combustion of the raw material S exemplified in Figs. 34 to 36, a tube bundle having the structure described below was obtained. This tube bundle is configured as a tubular tube bundle as a whole by a plurality of substantially cylindrical tubes. The plurality of pipe parts are in direct or indirect contact with each other to form a bundle of pipe parts forming the outer periphery of the rotating drum, and at the same time, within the rotating month for accommodating heating means for heating the rotating drum from the inside. It has a tube bundle structure that forms a cavity. Examples are shown in FIGS. 37, 38, and 39. The pipe part 40 illustrated in FIG. 37 (a) and the pipe part fixing member 3Oc illustrated in FIG. 37 (b) are combined to form a multi-tube composed of six pipe parts illustrated in FIG. 37 (c). A bundle 300 is formed. Fig. 38 shows that the cavity V in the rotating cylinder is formed at the approximate center of the tube bundle. As shown in the figure, it is advantageous in terms of efficient use of space, heat conduction, etc. that the pipe parts are in direct contact with each other to form a pipe part bundle part. Ask such efficiency If it is not the subject, it is possible to adopt a structure in which the pipe part is in indirect contact with the pipe part or a structure in which only the pipe part fixing member is in contact. FIG. 38 (a) shows a cut at α 1 — a 1 ′ of the tube portion bundle portion that does not include the tube portion fixing members 30cl, 30c2,... In the tube portion bundle 300 illustrated in FIG. 38 (b) is a cross-sectional view of the surface, and the raw materials S and ε ··· are put into the pipe portions 40, 40 ··· in the α ΐ — α ΐ 'cut surface 1 and stacked and deposited. It is a conceptual diagram which shows a state. FIG. 39 (a) is a diagram of the tube bundle 300 including the tube fixing members 30c1, 30c2,... In the tube bundle 300 illustrated in FIG. FIG. 39 (b) is a cross-sectional view of the cut surface 2, and FIG. 39 (b) shows a state in which the raw materials S and S. ”are put into the pipe portions 40, 40... FIG.

[0442] As shown in Fig. 37, using the pipe fixing member 30c with a hole in the center as shown in Fig. 37 (b), it is shown in Fig. 37 (c) together with the pipes 40, 40 ... As shown in FIG. 38 and FIG. 39, the tube part bundle 300 is formed, so that the inner part of the rotary month is formed so as to penetrate the tube part bundle substantially at the central portion of the pipe part bundle 300. The second heating means for heating the tube portions 40, 40,... From the inside of the tube portion bundle body is provided in the rotation month inner cavity V. By heating the tube bundle in combination with the first heating means that heats from the outside, the heating and firing efficiencies of the raw materials S and S '' 'put into the tubes 40, 40 ... I can improve it.

[0443] Further, as a result of repeated trials on a method of improving the stacking and deposition efficiency of the raw materials as shown in Figs. It reached the tube bundle. This tube bundle is configured as a tubular tube bundle as a whole by a plurality of substantially columnar tubes. Each substantially cylindrical tube portion has at least one multi-divided partition wall structure for dividing the inside thereof into a plurality of compartments by partition walls, and the plurality of substantially cylindrical tube portions are It is configured to form a tube bundle that forms an outer peripheral portion of the rotating drum by directly or indirectly contacting each other. Examples thereof are shown in FIG. 40, FIG. 41, and FIG. FIG. 40 shows a combination of the pipe part 40 whose interior is divided by the partition wall 50 shown in FIG. 40 (a) and the pipe part fixing member 30c shown in FIG. 40 (b). This is an example in which the multi-tube bundle 300 is formed by the six pipes illustrated in c), and the inner cavity V is formed in the substantially central portion of the pipe bundle. Figure 41 (a) FIG. 40C is a cross-sectional view of the cross-sectional view of the cut surface 3 at α 3 -α 3 ′ of the tube bundle member that does not include the tube fixing members 30cl, 30c2,. FIG. 41 (b) is a conceptual diagram showing a state in which raw materials S and S ′ ″ are injected into the tube portions 40, 40... On the α3-α3 ′ cut surface, and are stacked and deposited. 42 (a) is a cross-sectional view of the tube bundle bundle portion including the tube fixing members 30cl, 30c2,... In the tube bundle 300 illustrated in FIG. 42 (b) is a cross-sectional view of the cut surface in FIG. 42, and FIG. 42 (b) shows that the raw materials S and S '''are placed in the tube portions 40, 40. It is a conceptual diagram showing the state.

As illustrated in FIG. 40, FIG. 41, and FIG. 42, the inside of the plurality of tube portions 40, 40... Constituting the tube bundle 300 as the rotating drum of the rotary kiln furnace is defined by the partition wall 50. By using a multi-partition partition structure divided into a plurality of compartments 60, 60 ..., the raw materials S, S- injected into each pipe 40, 40 ... Compared with the pipe bundle 300, which is composed of the pipe parts 40, 40, which are dispersed in the above and illustrated in FIG. 38 and FIG. Stacking of raw material S, 3— in chambers 60, 60 ... can significantly reduce deposition and improve heating and firing efficiency.

[0445] However, the inside of the pipe sections 40, 40 ··· constituting the pipe bundle 300 as a rotary drum of the rotary kiln furnace described above is divided into a plurality of compartments 60, 60 ··· by the partition wall 50. By using a multi-partition partition structure, the stacking-deposition of raw materials S, S '..., put into the pipes 40, 40 ... can be greatly reduced, but on the other hand In order to introduce the raw materials S, S ... evenly into each of the plurality of compartments 60, 60 ... installed in the pipe sections 40, 40 ... It was found that a raw material input mechanism with a complicated structure different from the above is required.

[0446] Without using such a complicated raw material charging mechanism, a plurality of compartments 60, 60... Provided inside the pipe sections 40, 40. · An attempt was made to distribute raw materials S and S 'evenly and simply. As a result, the structure of the pipe bundle 300 is obtained by providing a multi-partition partition wall structure non-part on the raw material input direction side of the multi-partition partition structure part provided in the pipe parts 40, 40. The raw materials S and S are distributed evenly and easily into each compartment 60, 60 in the multi-partition partition wall structure. Devised a method. An example of this will be described with reference to FIGS. 38 and 41 described above. FIG. 38 is a cross-sectional view of the tube bundle 300 composed of the tube portions that are not divided into the tube portions 40, 40... FIG. On the other hand, in FIG. 41, as described above, the pipe part 40, 40... Is divided into a plurality of compartments 60, 60. 2 is a cross-sectional view of a tube bundle 300 composed of

[0447] The multi-partition partition wall structure portion illustrated in FIG. 38 is provided on the raw material input direction side of the multi-partition partition wall structure portion of the pipe portions 40, 40. Thus, the pipe bundle 300 can be rotated by the rotation of the pipe bundle 300 without using a complicated raw material charging mechanism for charging the raw material S into the respective compartments 60, 60. It has been found that the raw material S can be distributed evenly and very simply into the compartments 60, 60.

[0448] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The block diagram of an example of the heat processing apparatus provided with the rotary kiln furnace of this invention was shown. FIG. 43 is a configuration diagram of a heat treatment apparatus including the rotary kiln furnace 1 according to the present invention, and mainly illustrates components related to the flow of raw materials S, S ′ ″ and air (oxygen) in the rotary kiln furnace 1. . This heat treatment equipment is also called a continuous treatment type · indirectly heated (external heat type) rotary kiln. The rotating drum in the rotary kiln furnace 1 is composed of a plurality of pipe portions 40, 40... ′ Exemplified in conjunction with FIGS. The tube bundle 300a is formed so that the plurality of tube portions form the outer peripheral portion of the rotating drum, thereby forming a rotating drum. The inside of the tube bundle 300a is a cavity, and forms a rotary cylinder cavity V for accommodating a heating means for heating from the inside. In FIG. 43, raw materials S, S --- (for example, papermaking sludge) containing organic components are dehydrated or dried by a drying device (not shown), and then one end of the tube bundle 300a of the rotary kiln furnace 1 is used. Each pipe provided in the tube bundle 300a of the rotary kiln furnace 1 is inserted into the raw material supply port 2 (for example, supply hot bar) installed in the section and through the raw material input means 10 (for example, screw feeder 1). (For example, the pipe sections 40, 40,... In FIG. 38). Next, the raw materials S and S 'supplied to the pipe portions 40 and 40 of the pipe bundle 300a are contained while passing through the pipe portions 40 and 40. Organic components are burned, organic components are burned off The heated and fired product is taken out of the rotary kiln furnace 1 through the heating and fired product discharge port 8 installed at the end opposite to the raw material supply port 2 of the tube bundle 300a. If necessary, the heated / baked product is sent to the next step for processing such as grinding.

[0449] The tube bundle 300a is not shown in the drawings, but is inclined to a very gentle downward slope from the raw material supply port 2 side toward the heated and fired product discharge port 8 side. As a result of the inclination and rotation of this tube bundle 140a, the internal workpiece is gradually moved from the raw material supply port 2 side to the heated / baked product discharge port 8 side by gravity.

[0450] In the present invention, in order to obtain a high-whiteness, high-quality, heated and fired product by heating and firing the raw materials S and S 'containing organic components, a rotary kiln furnace 1 Introduce air into each of the pipes that make up the pipe bundle 300a (for example, the pipes 40, 40,... In FIG. 38) to remove the organic components contained in the raw materials S and S '' '. Burning is essential. Therefore, exhaust means 4 (eg, exhaust fan) is installed in the vicinity of the raw material supply port 8, and this exhaust means 4 forcibly exhausts the air in the rotary kiln furnace 1, thereby Air is sucked into the rotary kiln furnace 1 from the air supply port 3 installed in the vicinity as shown by the dashed arrow A (the figure is also changed). In this way, the air flow indicated by the broken line arrow A (the figure is also changed) from the air supply port 3 toward the exhaust means 4 is always generated. This air flow becomes the air flow A (not shown) for conveying unburned material, which will be described later.

[0451] The air amount is controlled by controlling the exhaust amount of the exhaust means 4 (exhaust fan).

This amount of air is controlled so as to be sucked in excessively so that the inside of each pipe section 40, 40 ·· 'provided in the pipe bundle 300a of the rotary kiln furnace 1 is in an excess (rich) oxygen atmosphere. I prefer that. The direction of this air introduction is indicated by the arrow B which advances by continuously supplying the raw materials S, S ′... To the respective pipe portions 40, 40,... Of the tube bundle 300a of the rotary kiln furnace 1. Air is introduced from a direction (abbreviated as a counterflow direction) indicated by a broken-line arrow A opposite to the direction.

[0452] This is because when raw materials S, S ... containing organic components are burned, unburned materials such as soot are generated. At that time, the arrows of movement of raw materials S, S ' When air is introduced in the direction indicated by the broken arrow A opposite to the direction indicated by B (direction indicated by the arrow A through which the air flows = counter-current direction), soot generated by the combustion of the raw materials S and S 'is introduced. Rest in the air ··· Raw material supply port of each pipe section 40, 40 ··· of pipe bundle 300a Raw material S newly moved into each pipe section 40, 40 ··· of pipe bundle 300a in eight directions , S · · · · Recombusted together, or exhausted by the exhaust means 4 and discharged from the rotary kiln furnace 1, and soot adheres to the heated and fired processed product outlet 8. This is because the whiteness can be improved efficiently without any problem.

[0453] On the other hand, the same direction as the direction indicated by the arrow B (the figure is also changed) of the raw materials S and S '' '

When air is introduced in the direction of the co-current flow, the soot generated by the burning of raw materials S and S '' 'on the introduced air moves in the direction of the heating / fired product outlet 8 and firing is performed. Heating that has been completed and whitening · Preferably because wrinkles adhere to the baked product and lower the whiteness!

[0454] The air flow indicated by the broken-line arrow A described above is introduced into each pipe section (for example, the pipe sections 40, 40,... In FIG. 38) provided in the pipe bundle 300a of the rotary kiln furnace 1. As a method for this, pressurized air can be blown from the air supply port 3 installed in the vicinity of the heated and baked product discharge port 8. As shown in FIG. 43 described above, the air of each pipe part 40, 40,... Of the pipe part bundle 300a is forced by the exhaust means 4 installed in the vicinity of the raw material supply port 2. A method is preferred in which air is sucked into the pipe portions 40, 40,... Of the pipe bundle 300a from the air supply port 3 installed in the vicinity of the heating / fired product discharge port 8 by exhausting.

[0455] This is because the exhaust means 4 provided on the opposite side of the air supply port 3 forcibly exhausts the air inside each pipe section 40, 40 ··· of the pipe section bundle 300a, and each pipe section 40 40 ... By making the inside of the negative pressure, the air flow indicated by the broken-line arrow A from the air supply port 3 to the exhaust means 4 direction always occurs stably, and the tube bundle 300a This is suitable for making it easy to distribute air to the raw materials S and S ′ ″ introduced into the pipe portions 40 and 40.

[0456] In the present invention, each of the pipe portions (for example, the pipe portions 40, 40 in Fig. 38) provided in the tube bundle 300a of the rotary kiln furnace 1 by forced exhaustion by the exhaust means 4 described above, etc. The amount of air supplied to the pipes 40, 40 ... 'is the amount of oxygen required to completely burn off the organic components contained in the raw materials S, S' ... The amount of air (excess (rich) oxygen atmosphere) that supplies an excessive amount of oxygen to the theoretical oxygen amount) is preferable. S, preferably within each tube section 40, 40 ... of the tube bundle 300a The amount of air supplied is 1 to the amount of oxygen (theoretical air);! To 5 times, preferably 1.5 to 5 times, more preferably 2 to 5 times It is particularly preferable that

[0457] On the other hand, if the amount of air supplied into each tube 40, 40 ··· of the tube bundle 300a is less than 1.1 times the theoretical air amount, each tube This is not preferable because the organic components contained in the raw materials S, S ′,... Contained in the parts 40, 40,. In addition, when the amount of air supplied into each of the pipe portions 40, 40,... Of the pipe portion bundle 300a exceeds five times the above-described theoretical air amount, the pipe portion bundle 300a is caused by the supplied air. The temperature inside each pipe section 40, 40 ··· may be excessively cooled, while the temperature inside each pipe section 40, 40 ··· of the pipe bundle 300 is maintained. Therefore, it is necessary to increase heating by the heating means 5a and the heating means 5b described later, which is not preferable in terms of energy cost.

FIG. 44 is a configuration diagram of a heat treatment apparatus including the rotary kiln furnace 1 having the tube bundle 300a as the rotary drum of the present invention having the same configuration as that of FIG. 43 described above, and is mainly a rotary kiln furnace. FIG. 2 is a configuration diagram illustrating components related to heating means 5a and 5b in 1. In the figure, description of components having the same reference numerals as those in FIG. 43 is omitted. As a heating / firing method of the rotary kiln furnace 1 in the present invention, an internal heating type heating / firing method may be used. However, as illustrated in FIG. 44, the tube portion of the rotary kiln furnace 1 is used. It is preferable that the heat for heating each pipe section (for example, the pipe sections 40, 40... In FIG. 38) provided in the bundle 300a is supplied from an indirect heating means. This indirect heating means is formed mainly in the indirect (outside) heating means 5a for heating indirectly from the outside of the tube bundle 300a and inside the tube bundle 300a as shown in FIGS. 38 and 39. The inner force of the tube bundle 300a accommodated in the inner cavity V of the rotating cylinder is an indirect (inner) heating means 5b for heating indirectly. By these heating means, the raw materials S, S... Put into the pipe portions 40, 40... Can be indirectly heated and fired. Forces not shown in the figure are omitted A so-called heating jacket is provided on the outer periphery of the rotary kiln furnace, to which an indirect heating means 5a is connected.

[0459] This is because it is indispensable to introduce a lot of air in order to burn the raw materials S, S '· · containing organic components, but in the external heating type heating system, the indirect heating means 5a, 5b are used for the pipe part. Each tube 40, 40 ... of the bundle 300a is indirectly heated, and air containing a large amount of oxygen is supplied to the inside of each tube 40, 40 ... from the air supply port 3. Each pipe part of body 140, 40 This is because the raw materials S, S ′,... Put into the pipe portions 40, 40,. In addition, when it is necessary to control the temperature at which the raw materials S and S 'are heated, the indirect heating provided on both the outside and inside of the tube bundle 300a is used in the external heating method. The means 5a and 5b can be used to stably control the temperature of the entire tube portion 40, 40... Of the tube bundle 300a in the longitudinal direction of the rotation axis, which is preferable. In contrast, in the internal heating type heating system, the air (oxygen) inside the kiln furnace 7 is consumed in large quantities for the combustion of the heating burner. This is not preferable. In addition, in the internal heating type heating system, it is inevitable that the temperature in the vicinity of the heating burner becomes high, and the gradient in the temperature in the direction of the rotation axis in the tube bundle 300a becomes uneven, resulting in the tube bundle 300a. Since it is difficult to control the whole to the desired constant heating and firing temperature, the entire temperature of the tube bundle 300a tends to be non-uniform.

[0460] In addition, as a method of heating the tube bundle 300a, an indirect (outside) heating means 5a that indirectly heats from the outside of the tube bundle 300a described above, and the tube bundle 300a described above Indirect heating means 5b for heating from the inside is preferably used in combination with heating from both the outside and inside of the tube bundle 300a.

[0461] This is because when the number of pipe parts (for example, the pipe parts 40, 40,... In FIG. 38) is increased, the pipe parts 40, 40,. It is possible to improve the heating-firing efficiency by applying sufficient and even heat, and to the raw materials S, S '' 'put into each pipe part 40, 40 ... of the pipe bundle 300a. On the other hand, when it is necessary to control the heating / firing temperature, the heating means 5a and 5b provided on both the outer and inner sides of the tube bundle 300a are used to make the heating and firing temperature uniform and accurate. This is because it can be controlled well and is preferable.

[0462] On the other hand, only the indirect heating means 5a for heating the tube bundle 300a from the outside, the tube portions 40, 40 constituting the tube bundle 300a in order to reduce the stacking / deposition of the raw material S. · When the number of is increased, each tube 40, 40 · · · V, which can not be heated sufficiently and evenly, is preferable because there is a fear! In addition, only the indirect heating means 5a for heating the tube bundle 300a from the outside can control the heating and firing temperature with sufficient accuracy when it is necessary to control the temperature at which the raw material S is heated and fired. Because there is a fear that can not Absent.

[0463] In the present invention, the method for forming the inner cavity V for accommodating the heating means 5b for heating from the inside of the tube bundle 300a includes the above-described Fig. 37, Fig. 38, and Fig. 38. As shown in Fig. 39, the force that can be formed as a hollow inner space V as the central cavity is inevitably generated by bundling a plurality of pipes 40, 40 ... in a cylindrical shape. As described above, the rotating month inner cavity V can be formed by providing the tube part 40c for the rotating month inner cavity at the center of the tube bundle 300a. In this case, the cross-sectional view of the cut surface of the tube bundle 300a at α5-α5 'and the cross-sectional view of the cut surface at α6-α6' are shown in FIG. Since 40c penetrates, both are cross-sectional views of the same shape shown in FIG.

[0464] The heating method used for the indirect heating means 5a and 5b of the present invention is an electric heater or a force that can be heated by induction current. From the viewpoint of energy cost, the inside of the heating jacket that surrounds the cylindrical furnace body Introducing combustion gas such as kerosene and heavy oil, combustion exhaust gas discharged from existing incineration equipment, high-temperature air, superheated steam, etc., or heating by blowing combustion gas from the gas burner to the peripheral wall of the processing furnace Is recommended. In addition, high-temperature exhaust gas that has undergone combustion treatment in the furnace body and combustion exhaust gas from the pretreatment drying step can also be used as part of the heat source of the heating means. In addition, in the example shown in FIG. 43, the pre-process of the heat treatment apparatus provided with the rotary kiln furnace 1 of the present invention as illustrated in FIG. 46 described later by the circulation blower which is an example of the hot air circulation means 7. (Drying process, primary firing process, etc.) Power and other combustion exhaust gas can be supplied as an indirect heating means.

[0465] For the cavity V in the rotating drum for accommodating the heating means 5b for heating the tube bundle 300a from the inside, if the heating means 5b can be accommodated, the front and rear ports of the cavity in the tube bundle 300a It is preferable to make a closed space between them for the reason explained below. That is, as described above, the combustion efficiency of the raw materials S, S ′,... Introduced into each pipe part of the pipe bundle 300a (for example, the pipe parts 40, 40,... In FIG. 38) is improved. Therefore, it is necessary to introduce a large amount of air into the pipe sections 40, 40 ... It is preferable not to arrange them. In particular, the pipe bundle bundle exhaust side, that is, the side equipped with the exhaust means 4, in other words, the raw material supply port 2 side and the vicinity of the pipe bundle bundle is originally a material feeder such as a screw feeder. Step 10 is inevitable. It is preferable to avoid as many such obstacles as possible. In this regard, when the electric heating means described above is used, the electricity supply path is relatively small and is not such an obstacle, which is preferable.

However, in view of economic efficiency as a heating means, it is more preferable to employ a heating means that uses a heating medium such as combustion exhaust gas. In such a case, it is necessary to adopt a configuration in which the heating medium enters the rotary cylinder cavity V from the entrance, passes through the rotary cylinder cavity V, exhausts the heat to the pipe portion, and exits from the exit. If such a structure is simply considered, a structure having a heating medium supply pipe and a heating medium discharge pipe communicating with the inner cavity V of the rotating month is obtained. In other words, a heating medium pipe penetrating from the pipe bundle bundle intake side to the pipe bundle bundle exhaust side is provided to penetrate the central axis direction of the rotary kiln furnace. However, the existence of such a through pipe, particularly on the exhaust side of the tube bundle, is not preferable because it becomes an obstacle for air introduction and passage as described above. As one measure, it is possible to reduce the degree of such obstacles by narrowing the heating medium piping after exiting the cavity in the rotating drum. In addition, when heating the cavity V in the rotating drum with such a heating medium, it is better not to use the tube 40c for forming the cavity as described in FIG. It is preferable in that the outer wall can be heated.

[0467] In order to avoid such an air introduction and passage obstacle as much as possible, it is also possible to provide a heating medium pipe only on the pipe section bundle intake side. In this case, the heating medium pipe has a double structure. That is, a concentric double pipe structure or a simple parallel double pipe structure is connected to the cavity V in the rotating drum, and the heating medium supply pipe is opened in the cavity V, particularly near the pipe 40c. In this structure, the heating medium is discharged, and the medium after heat release is sucked into the heating medium discharge pipe opened at the center of the cavity V. In other words, a known maze piping structure for efficient indirect heating is placed in the cavity V in the rotating drum with the force S.

[0468] FIG. 40, FIG. 41, and FIG. 42 show the respective pipe parts (for example, the pipe parts 40, 40... In FIG. 38) of the pipe bundle 300a of the rotary kiln furnace 1 described above. As illustrated, a method of providing a multi-divided partition wall structure section that divides the inside of the pipe sections 40, 40... Into a plurality of compartments 60, 60. Combined with the multi-partition partition structure An example to which the method used is applied will be described with reference to FIG.

[0469] FIG. 47 is a configuration diagram of a heat treatment apparatus including the rotary kiln furnace 1 illustrated in FIG. 43 and FIG. 44 described above, and mainly relates to the tube bundle 300b in the rotary kiln furnace 1. It is a block diagram explaining a component. In the figure, description of components having the same reference numerals as those in FIGS. 43 and 44 is omitted. As shown in FIG. 37, the basic configuration of the pipe bundle 300b in FIG. 47 is composed of a plurality of pipe parts 40, 40, and each pipe part 40, 40,. Force that is bundled by the tube portion fixing member 30c to form the tube portion bundle 300b. Further, in FIG. 47, a part of the tube portions 40, 40,... Is characterized in that it has a multi-partition partition wall structure 320. 47. As the structure of the multi-partition partition structure 320 in the tube bundle 300b of FIG. 47, the structure of the cut surface at α 8 —α 8 ′ is shown by the partition 50 illustrated in FIG. · The inside has a structure divided into a plurality of compartments 60, 60 · · ·.

[0470] In Fig. 47, the tube bundle 300b in the rotary kiln furnace 1 is the front side of the multi-partition partition structure 320, that is, the raw material input direction side of the multi-partition partition structure 320, V In other words, the multi-partition partition wall structure portion (accommodating) portion 310 is provided on the raw material supply port 2 side of the tube bundle 300b. As the structure of the multi-partition partition wall structure non-contained portion 310, the pipe 40, 40,... Illustrated in FIG. It has a structure that is not divided into compartments. In addition, in FIG. 47, the multi-partition partition structure 320 and the subsequent parts, that is, the heating and firing process side of the multi-partition partition structure 320, the discharge direction side of the fired product, V, and, in other words, the tube bundle 300b is heated and fired. The same structure portion as the multi-partition partition wall structure portion non-contained (accommodating) portion 310 is also provided on the object discharge port 8 side up to the end portion of the tube portion bundle 300b.

[0471] Hereinafter, the multi-partition partition structure 320 in the tube bundle 300b of the present invention will be described. As shown in FIG. 40, FIG. 41, and FIG. 42, the partition wall structure portion 320 for multi-division is basically the inside of the plurality of tube portions 40, 40,. Therefore, it is divided into a plurality of compartments 60, 60..., And each compartment 60, 60... Communicates from the raw material entrance side to the exit side of the multi-partition partition wall structure 320.

[0472] In the partition wall structure section 320 for multi-division, a plurality of pipe sections 40, 40, ... by the partition wall 50 As shown in Fig. 41 and Fig. 42, the section chambers 60, 60 are divided radially from the center of the cross section of the pipe section 4, 4, ... in the outer direction of the pipe section. The partition wall 50 is provided to divide the inside of the pipe sections 40, 40... Into a plurality of partition chambers 60, 60..., And the partition chambers 60, 60. The compartments 60, 60,... Are preferably formed so that their cross-sectional shapes are substantially congruent. This is because the internal parts of the pipe sections 40, 40 ... are divided into section chambers 60, 60 S, S— can be distributed almost uniformly into the respective compartments 60, 60 ..., and the raw materials S, S '''supplied to the pipes 40, 40 ... This is because heating and firing can be performed.

In the present invention, the number of the compartments 60, 60,... Provided in the pipe parts 40, 40,. It is preferable to set the number of rooms to 12 or more and particularly preferably 6 to 8 rooms. This is because if the number of compartments 60, 60 "'divided by the radial partition wall 50 is 6-8, the compartments 60, 60 provided in the pipe sections 40, 40 ... Because the number increases appropriately, the raw materials S, S '..., which are put into each pipe section 40, 40 ... The raw materials S and S introduced into the compartments 60 and 60 can be sufficiently reduced and the sectional shapes of the compartments 60 and 60 have a relatively wide sectional area. This is because it can be sufficiently stirred and the heating and firing efficiency of the raw materials S, S -... can be improved, and each of the pipe sections 40, 40 ... is divided into compartments 60, The number of 60 ... as a matter of course, it is possible to exceed 12 chambers. When exceeding 12 chambers, the sectional shape of each compartment 60, 60 ... becomes very thin and narrow. ,cross section However, since the raw materials S, S ... charged into the compartments 60, 60 ... are not sufficiently stirred, the heating / firing efficiency of the raw materials S, S ... may be reduced. It is not preferable.

[0474] Further, as illustrated in FIG. 47, the method of using the multi-partition partition wall structure non-part 310 in the present invention in combination with the multi-partition partition structure 320 described above is a tube bundle 300b. The multi-partition partition wall structure part 310 is continuously provided on the raw material input direction side of the multi-partition partition structure part 320 in each of the pipe sections 40, 40. Each of the compartments 6 of the partition wall structure part 320 for multi-division by the rotation of the pipe parts 40, 40. It is a method that enables raw materials S and S 'to be evenly and automatically added to 0, 60.

[0475] Usually, as illustrated in FIG. 38 and FIG. 39, the compartments 60, 60,... Divided by the partition 50 in the pipes 40, 40 in the pipe bundle 300 of the kiln. Is not provided, the raw materials S, S… put into each pipe 40, 40 ... are only stacked and deposited on the bottom bottom of each pipe 40, 40 ... Many spaces are created in each pipe section 40, 40 ..., and the space in each pipe section 40, 40 ... provided in the pipe bundle 300b cannot be used sufficiently effectively. Absent.

[0476] Further, as illustrated in FIG. 41 and FIG. 42, the multi-partition partition wall structure 320 is formed of a tube bundle.

When the pipes 40, 40 in the 300b are provided in the entire area, the raw materials S, S— for the compartments 60, 60, etc. provided in the pipes 40, 40,. It is very difficult to uniformly feed the materials, and in order to throw the raw material particles S and ε into the compartments 60 and 60, an extremely complicated raw material feeding mechanism is required. It had a large practical problem.

[0477] As a result of diligent research on these problems, the inventors, as illustrated in Fig. 47 described above, for each of the tube portions 40, 40 ··· in the tube bundle 300b. 41 and 42 are provided by providing the multi-partition partition wall structure 320 and further providing the multi-partition partition wall structure non-part 310 on the raw material input direction side of the multi-partition partition structure 320. As shown in Fig. 4, the raw materials S and S --- can be evenly charged into the respective compartments 60 and 60 provided in the pipe sections 40 and 40. It was found that the space in each pipe section 40, 40 ··· can be effectively used for the reduction of stacking and accumulation of S '··.

[0478] The principle mechanism in which the raw materials S and S '''charged into the respective compartments 60, 60... Provided in the pipe sections 40, 40. This will be described below. In FIG. 47, first, raw materials S, S ′... Are supplied to the raw material supply port 2 of the pipe sections 40, 40. As shown in Fig. 38, the raw materials S and S 'are stacked and deposited on the bottom bottom of each pipe part 4, 40 .... The rotation of the pipe bundle 300b as the same rotation month By moving the inside of each pipe part 40, 40 ... by one rotation, the inside of the pipe part 40, 40 ... is heated. Moves inward direction of the pipe part 40, 40 ... in which the structural part 320 is provided To do.

[0479] Next, the raw material S, S '· · · moved while being stacked and deposited in the lower bottom portion of the multi-partition partition wall structure non-portion 310 of each of the pipe portions 40 and 40 · · Portions 40, 40... Reach the multi-divided partition wall structure portion 320 provided in the inner part. At this time, since the pipe portions 40, 40... Are also rotated due to the rotation of the pipe bundle 300b, as illustrated in FIG. 41, each compartment 60, 60 ... 'will also circulate to the lower bottom of each pipe 40, 40 ... by rotation, and each of the multi-partitioned partition wall structure 320 that has circulated to the lower bottom of this pipe 40, 40 ... Since the raw material S, S '... moves sequentially from the partition wall structure part 310 for multi-division to the compartments 60, 60 ..., each pipe 40, 40 ... The raw materials S and S 'are automatically and evenly supplied to the compartments 60 and 60 in the multi-partition partition structure 320.

[0480] As described above, the multi-partition partition structure part no part 310 is provided on the raw material supply port 2 side of the multi-partition partition structure part 320 and is continuously combined with the multi-partition partition structure part 320. Therefore, the method of automatically introducing the raw materials S and S'H to the respective compartments 60 and 60 of the multi-partition partition structure 320 is as follows. · The structural principle that does not require the introduction of special and complex raw material input machinery for raw materials is also very preferred because it is very simple!

[0481] Example of the structure provided in each of the pipe sections 40, 40 ... of the pipe bundle 300c, 300d by combining the multi-partition partition structure part 310 and the multi-partition partition structure 320 described above This is illustrated in Figs. 48 and 49. Fig. 48 is a partial cross-sectional view showing an example of the structure of the tube bundle 300a or 300b in the rotary kiln furnace 1 illustrated in Fig. 43, Fig. 44, and Fig. 47 described above. An example in which a plurality of parts 320 are provided in each pipe part 40, 40,... Of the pipe part bundle 300c is shown. Fig. 48 shows the force as an example of the partition wall structure 320 for multi-division provided at the three front, middle, and rear positions in each tube 40, 40 ... of the tube bundle 300c. As described above, a plurality of partition wall structures 320 for multi-division can be installed in the pipe parts 40, 40,... Of the pipe part bundle 300c of the kiln as necessary.

FIG. 49 is a partial cross-sectional view showing an example of the structure of the tube bundle 300a or 300b in the rotary kiln furnace 1 illustrated in FIGS. 43, 44, and 47 described above. Bulkhead structure 3 An example is shown in which 20 is provided in almost the entire region within each of the tube portions 40, 40... Of the tube bundle 300d. As illustrated in FIG. 49, after the multi-partition partition wall structure non-part 310 is provided in the vicinity of the raw material supply port 2 in each pipe part 40, 40 ... of the pipe part bundle 300d, By heating the inside of each pipe part 40, 40 · · · Inside of the fired product discharge port 8 and by providing the multi-partition partition structure part 320 continuously in almost all areas, the pipe part bundle 300d Almost the entire area within each pipe section 40, 40... Can be made into a multi-partition partition wall structure section 320.

[0483] Further, as illustrated in FIG. 48 described above, each pipe portion 40, 40 · · · of the pipe bundle 300c of the kiln

In contrast, in the case where a plurality of multi-divided partition wall structure parts 320 are provided, for example, as the multi-divided partition wall structure part 320, for example, a multi-partition partition wall structure part 320 having only a six-partition type is provided at a plurality of parts. As in the case of the multi-partition partition structure 320 divided into three or more compartments, one type of multi-partition partition structure may be selected and used. For example, as the 3 to 8 division type multi-partition partition structure, a 3 division type, a 6 division type, an 8 division type, etc. are provided together. Alternatively, two or more different types of multi-divided partition wall structures 320 having different cross-sectional shapes may be selected and used from among multiple types of multi-divided partition wall structures 320! /.

[0484] Further, as illustrated in Figs. 47, 48 and 49, the multi-partition partition wall structure in each of the pipe portions 40, 40 · · · of the pipe portion bundles 300b, 300c, 300d. With respect to 320, the length L1 of the rotating barrel shaft length direction of the multi-partition partition wall structure non-part 310 provided on the raw material supply port 2 side of the multi-partition partition structure part 320 is 0. 0m is preferred 0.3-3. Om is particularly preferred.

[0485] This is because the multi-partition partition wall structure non-portion 310 rotates while holding the raw materials S, S '···, and is provided following the multi-partition partition wall structure non-portion 310. Multi-divided partition wall structure section 320 Because there is a need to feed raw materials S and S '' 'stably and evenly into each compartment 60, 60 ... This is because it is necessary to provide a certain area (length) as the portion 310 in the longitudinal direction of the rotating drum axis of the tube bundle 300.

[0486] On the other hand, when the length L1 of the multi-partition partition wall structure non-portion 310 in the longitudinal axis direction of the rotary cylinder is less than 0.1 lm, the multi-partition partition wall structure non-portion 310 is inserted. It is preferable because it is difficult to keep the raw materials S, S '... Yes. In addition, if the length LI of the multi-partition bulkhead structure 310 in the rotation moon coaxial length direction exceeds 5. Om, the input raw materials s, ε In 310, the length L1 is 5. Om or less, and the length L1 can be held sufficiently stably and evenly.

[0487] Further, as illustrated in FIGS. 47, 48, and 49 described above, the multi-partition partition wall structure 320 provided for each of the pipe portions 40, 40,. The length L2 in the longitudinal direction of the rotary drum axis is preferably 0.3 to 50 m, and particularly preferably 0.5 to 30 m. This is because it is necessary to hold the raw materials S, S... In the multi-partition partition structure 320 for the time required for heating and baking the raw materials S and S′H. This is because it is necessary to provide a certain area (length) as the structural portion 320 in the direction of the length of the rotation axis of the tube bundle 300.

[0488] On the other hand, when the length L2 of the multi-partition partition wall structure 320 in the rotational barrel axis length direction is less than 0.3 m, the raw materials S, S. It is not preferable because it is difficult to ensure heating and firing time. In addition, it is unlikely that the length L2 of the multi-partition partition wall structure 320 in the axial direction of the rotary cylinder exceeds 50 m. If this length is sufficient, the input raw material S can be sufficiently heated and baked in the section of the multi-partition partition wall structure 320, so it is useless to make it longer. Because it becomes.

[0489] In the present invention, the outer diameter of each of the pipe portions 40, 40, ... provided in the pipe bundle 300 is 1/8 or more of the outer diameter of the pipe bundle 300, 1 / 2 or less is preferable. This is because the outer diameter of the pipe sections 40, 40,... Provided in the pipe section bundle 300 is set to a size in the above-described range, so that the pipe sections 40, 40,. Increase the heat transfer area by increasing the number, and reduce the stacking / deposition of raw materials S and S '... and a tube part to heat and bake a sufficient amount of raw materials S, S' ... This is because it is possible to achieve both a volume of 40 and so on, which is preferable. In the present invention, by defining the outer diameter of the pipe sections 40, 40... As 1/8 or more of the outer diameter of the pipe section bundle 300 as described above, as illustrated in FIG. A single tube can be provided in the tube bundle 14. Here, the outer diameter of the pipe is the outer diameter of a circle with the same cross-sectional area when the cross section has a shape other than a circle. On the other hand, when the outer diameter of the pipe portions 40, 40... Provided in the pipe bundle 300 is more than 1/2 of the outer diameter of the pipe bundle 300, a plurality of pipes 40, 40. It is not preferable because the pipe portions 40, 40... Cannot be provided in the pipe bundle 300, and the stacking-stacking of the raw materials S, S. .. cannot be reduced and the heat transfer efficiency cannot be improved. . Further, when the outer diameter of the pipe portions 40, 40... Provided in the pipe bundle 300 is less than 1/8 of the outer diameter of the pipe bundle 300, the above-mentioned 21 or more sufficient · · · · · · · · · · · ······································ Since the total volume is significantly reduced, it is not possible to secure the kiln furnace volume necessary to heat and sinter raw materials S, S…, and increase the throughput of raw materials S, S '· · · sufficiently I can't! /, Which is preferable for.

[0490] The outer diameter of the tube bundle 300 in the present invention is preferably 0.2 to 8. Om, and more preferably 0.3 to 5. Om. When the outer diameter of the tube bundle 300 as a rotating drum is less than 0.2 m, it is not preferable because it is difficult to process a desired amount of raw materials S, S '. When the outer diameter of the bundle 300 exceeds 8. Om, the heat treatment apparatus becomes excessively large and becomes impractical.

[0491] In addition, the outer diameter of the pipe portions 40, 40 ... provided in the pipe bundle 300 according to the present invention is determined depending on the outer diameter of the pipe bundle 300 as a rotating drum as described above. Therefore, the outer diameter of the pipe portions 40, 40... Is preferably 0.025-4.Om, and particularly preferably 0.0375 to 2.5 m.

[0492] As the method of forming the multi-partition partition wall structure 320 in the present invention, various methods without particular limitation can be used. As an example of this, FIG. 51 illustrates a method of forming the multi-partition partition wall structure 320. In FIG. 51, a multi-partitioning partition 50c to be a partition wall 50 is placed inside each pipe section 40, 40 ..., and the inside of the pipe section 40, 40 ... is divided into a plurality of compartments 60, 60 ... An example of a method of forming a desired multi-partition partition wall structure 320 by dividing is shown. As illustrated in FIG. 51, by inserting the multi-partitioning partition 50c into the pipe part, the inside of each pipe part 40, 40... Can be made into the multi-partition partition structure part 320. In addition, the section of the pipe portion where the multi-dividing partition 50c is not inserted becomes the multi-dividing partition wall structure portion 310.

[0493] When the multi-dividing partition 50c is inserted into each of the pipe portions 40, 40 ···, a part of the multi-dividing partition 50c is joined to the inner wall of the pipe portion 40 by welding or the like. Can be fixed. [0494] Further, the multi-partitioning partition 50c is inserted into the pipe part 40 but is not fixed, but can be rotated inside the pipe part (the driven rotary multi-partitioning partition 50s, see Fig. 53 described later). It may be. That is, as the tube bundle 300 is rotated, it is driven to rotate in the tube 40, which is called a driven rotation type. By making the multi-split partition 50c a driven rotary multi-split partition 50 s, it is easy to access the driven rotary multi-split partition 50s from the pipe section 40, 40 Furnace maintenance · There is an advantage that maintenance work becomes easy.

An example of the structure of the driven rotary multi-partitioning partition 50s is shown in FIG. Fig. 53 is an example of a 6-splitting driven rotary multi-division system 50s for dividing the pipe section 40, 40 ... into 6 compartments. FIG. 53 is a perspective view of the dividing partition 50s, and FIG. 53 (b) is a cross-sectional view in the horizontal direction orthogonal to the rotation axis of the multi-dividing partition 50s. As shown in FIG. 53, the driven rotary multi-partitioning partition 50s as illustrated in FIG. 53 is inserted into each of the tube sections 40, 40. · The interior can be divided into multiple compartments (in Fig. 51, one compartment is divided into 6 compartments). In this example, there are six partition walls for the multi-partition partition 50s, and the force S was an example that can create six compartments. The number of partition walls can be adjusted as appropriate. It is the same as the range of the number, 3 to; a range where about 12 compartments can be formed is preferable.

[0496] When the driven rotary multi-partitioning partition 50s is inserted without being fixed in the pipe part, the outer diameter of the driven rotary multi-partitioning partition 50s is made smaller than the inner diameter of the pipe part. Specifically, the outer diameter of the driven rotary multi-partitioning partition 50s should be 0.5-5 to 99 times larger than the inner diameter of the pipe sections 40, 40 ... It is particularly preferable that the ratio is 0 · 8 to 0 · 97 times. Pipe section 40, 40 ········ Following rotary multi-partitioning partition 50s inserted into inner diameter force S, less than 0.5 times the inner diameter of pipe section 40, 40 ···· In some cases, the size of the driven rotary multi-division partition 50s is too small, and the raw materials S and S 'placed in the pipe sections 40 and 40 can be sufficiently divided and held. This is not preferable because there is a risk of being unable to do so. Also, the size of the outer diameter of the driven rotary multi-partitioning partition 50s inserted into the pipe 40, 40 ... is more than 0.99 times the size of the inner diameter of the 1S pipe 40, 40 ... The driven rotary multi-partitioning partition 50s has a small margin with respect to the inner diameter of the pipe section 40, 40 ... There is a risk that the driven rotation will stop, In maintenance and inspection, it may be difficult to insert or remove the driven rotary multi-partitioning partition 50s into or from the pipes 40, 40, etc. I don't like it.

[0497] Needless to say, the driven rotary multi-partitioning partition 50s is shorter than the length of the inserted pipe part, but it may be divided into two or three. In such a case, the weight of one becomes smaller and the driven rotation becomes easier.

[0498] However, when the multi-splitting partition 50s is the driven rotary multi-splitting partition 50s as described above, a gap is formed between the multi-splitting partition having a reduced diameter and the inner wall of the pipe portion. There is a risk that the raw materials S, S,. 54 shows a conceptual diagram showing the accumulation state of the raw materials S, S ′... In the pipe 40 when the raw materials S, S... Are put into the pipe 40 into which the driven rotary multi-partition partition 50s is inserted. .

In FIG. 54, the raw materials S, S... Put into the pipe part 40 are divided into six by the driven rotary multi-partitioning partition 5 Os and accumulated. This accumulated raw material S, S '"is a force that flows due to the rotation C of the pipe section 40. At that time, as shown in the broken line B frame in Fig. 54, the space between the multi-partition partition 50s and the inner wall of the pipe section The raw materials S, S '' are caught in the gaps generated in the material, and the raw materials S, S '··· are probably crushed and shattered due to the weight of the dividing partition 50s. The shattering of the raw materials S, S '... disturbs the effect of improving the combustion efficiency due to the uniform heating of the raw materials by the granulation of the raw materials S, S' ... and the improved contact with air. This is not preferable.

[0500] In order to improve the problem, the raw materials S, S '· · · are crushed by the driven rotary multi-dividing partition 50s as described above. It is preferable to provide a damming member. An example of a structure in which a blocking member is provided on the partition plate of the driven rotary multi-dividing partition 50s is illustrated in FIG. 55 and FIG. FIG. 55 is a configuration diagram of a multi-splitting partition 50sl in which a blocking member 390a is added to the vicinity of the outer peripheral tip of the partition plate having the configuration of the driven rotary multi-splitting partition 50s illustrated in FIG. 53. FIG. 55 (a) is a perspective view of the multi-dividing partition 50sl, and FIG. 55 (b) is a cross-sectional view in the lateral direction orthogonal to the rotation axis direction of the multi-dividing partition 50sl. Further, FIG. 56 shows a damming member 3 attached to the outer peripheral tip portion of the partition plate having the configuration of the driven rotary multi-division partition 50s illustrated in FIG. Fig. 56 is a configuration diagram of multi-splitting partition 50s2 with 90b added, of which Fig. 56 (a) is a perspective view of multi-splitting cutting 50s2, and Fig. 56 (b) is the direction of the rotation axis of multi-splitting partition 50s2. It is sectional drawing of the horizontal direction orthogonal to.

[0501] Of the raw materials S, S ... in the pipe 40 when the raw materials S, S ... are introduced into the pipe 40 into which the multi-dividing partition 50sl provided with the blocking member 390a illustrated in Fig. 56 is inserted. A conceptual diagram showing the deposition state is illustrated in Fig. 57.

[0502] In Fig. 57, as in Fig. 54, the raw materials S and S '"thrown into the pipe 40 are divided into six by the driven rotary multi-division partition 50s 1 and accumulated. In the same way as in Fig. 54, the raw material S, S • · 'is also flowed by the rotation C of the tube 40. In this case, in Fig. 56, the raw material S, S. As a result, the raw material S, S '· · · is not sandwiched in the gap formed between the driven rotary multi-partitioning partition 50sl and the inner wall of the pipe, and the raw material S, S Can be prevented.

[0503] Regarding the installation conditions of the blocking members 390a and 390b for the multi-splitting partitions 50sl and 50s2, the position where the blocking members 390a and 390b are installed on the partition plate is within 50cm from the outer peripheral tip of the partition plate It is particularly preferable that the distance is within 10 cm. Positioning force to provide damming members 390a and 390b to the partition plate When the slab members 390a and 390b are separated from the tip of the outer periphery of the partition plate by 50 cm or more (approaching the center of the rotating shaft), Is prevented from spreading the raw materials S, S ′... On the partition plate, and the stacking of the raw materials S, S ′.

[0504] Regarding the heights of the blocking members 390a and 390b, the raw materials S and S... Put into the pipe part 40 are all received by the blocking members 390a and 390b, and the partition and the inner wall of the pipe part are Considering the input amount of raw materials S, S '..., and the stacking height of raw materials S, S *' in the pipe, etc. The stop members 390a and 390b can be provided by appropriately adjusting the height.

[0505] Regarding the driven rotary multi-partitioning partition 50sl provided with the blocking member 390a on the partition plate, as illustrated in FIG. 58, each pipe part 40 constituting the pipe part bundle 300 of the rotary kiln furnace is used. 40 is used for purchase. [0506] Note that the end of the multi-partitioning partition described above rubs against the inner wall of the pipe, so it is necessary to finish with an error or to change the material of the end to a material more resistant to friction. A coating process such as plating, spraying, or the like may be performed.

[0507] In addition, in the present invention, in addition to dividing the inside of each pipe portion 40, 40 ··· of the pipe portion bundle 300 into a plurality of compartments 60, 60 ··· by the partition wall 50 described above, 52, as shown in FIG. 52, a plurality of lifting plates 380 (both lifters) are attached to the inner wall of the pipe sections 40, 40, and the surface of the partition wall 50, which is divided into the division chambers 60, 60. Can be called S). Regarding the shape and size of the above-described flying plate 380, there is no particular limitation within the pipe sections 40, 40... And the compartments 60, 60. The raw material particles 1, 1 ··· can be appropriately selected and used within a range that does not hinder the flow of the particles.

[0508] Further, in the example illustrated above, the force has been described by taking the cylindrical portion as the tube portion as an example. As the cross-sectional shape of each tube portion 40, 40 ··· constituting the tube portion bundle 300 in the present invention, In particular, the tube portion having any cross-sectional shape such as a substantially circular shape, a substantially elliptical shape, or a substantially polygonal shape that is substantially triangular or more can be arbitrarily selected and used without limitation.

[0509] Further, the pipe bundle 300 provided in the rotary kiln furnace 1 according to the present invention, that is, the pipe parts 40, 40, each pipe part fixing member 30cl, 30α2, ..., and the partition wall for multi-division The material of the material constituting the bulkhead 50 (multi-partitioning partition 50s, 50s) for constructing the structural part 320 and other parts related to the tube bundle 300 is composed of a material that can withstand heating and firing. It is particularly preferable that the material be able to withstand a temperature of about 1000 ° C as the temperature during heating and firing. In addition, when raw materials containing organic components are heated and baked, acidic or alkaline components may be generated. Therefore, stainless steel and titanium that are highly preferred to be made of materials that can withstand acidic and alkaline properties are preferred. Steel materials with heat resistance and corrosion resistance are preferred.

[0510] In addition, the steel plate material constituting the partition wall 50 of the multi-partition partition structure 320 in the present invention may be formed of the above-described metal plate such as stainless steel, but is further perforated like a punching metal. It is preferable to use mushroom metal plates. This is perforated! /, N! /, The perforated metal plate is more divided than the metal plate for the raw materials S and S --- that are put in each compartment 60, 60… Air (oxygen) through holes provided in partition wall structure 320 This is because it becomes easier. There are various shapes and sizes of holes in the perforated metal plate, but the shape and size of the holes in the perforated metal plate used in the present invention are not specifically limited. When the raw materials S and S— are put into the respective compartments 60 and 60 of the partition wall structure section 320 for multi-division, the raw materials S and S ′ '' are spilled from the holes provided in the partition wall 50, etc. As long as it does not move into the compartment, it is possible to use various types of perforated metal plates such as round, triangular, quadrangular, and slit shapes.

[0511] In the present invention, the raw materials S, S, which are charged into the pipe sections 40, 40 of the pipe bundle 300 of the rotary kiln furnace 1 are the pipe sections 40, 40,. In order to reduce the stacking of raw materials S, S '··· and improve the efficiency of contact with air (oxygen), after the granulation process, put it into the tube bundle 300 as a rotating month Is preferred (see FIG. 46). As a method of granulating the raw materials S, S ′, etc., as a method of granulating and forming into a certain particle shape, a compression granulation method using a compression molding machine such as a bucket machine or a roller compactor, rolling rolling Examples include a granulation method, an agitation granulation method, and an extrusion molding method, and a method of adjusting the size with a screw feeder or the like is given as a method of granulating and molding into a particle shape within a certain size range. In order to granulate the raw materials S, S... Into a desired shape and size, the above-described granulation and molding methods can be appropriately selected and used. In addition, the shape of the raw material S, S ′ ″ to be put into each pipe part 40, 40 · of the pipe bundle 300 is not particularly limited, and has a size (diameter or length) described later. If it is within the range, it can be granulated and formed into various particle shapes such as columnar, spherical, elliptical, triangular, other polygonal shapes, force, serrated shape, and uneven shape.

[0512] The size for granulating the raw materials S, S ... in the present invention is such that the diameter or length is 2 to 30 mm, preferably S, and more preferably 5 to 15 mm. When the diameter of raw materials S and S * '' when granulated is less than 2mm, each pipe part 40, 40 ... The stacking of raw materials S, S '... in each compartment 60, 60 ..., etc. of partition wall structure 320 becomes overly dense, and air (oxygen) does not spread within the stacked raw material particles S, S' ... For this reason, the organic components contained in the raw material particles S, S ′... Are incompletely combusted, and the whiteness of the heated / baked product may be lowered. If the diameter or length of the raw materials S, S '... exceeds 30mm, the size of the raw materials S, S' ... is excessive, and the raw materials S, S '... Air (oxygen) is difficult to reach As a result, an incompletely combusted portion may remain in the center of the raw material s, ε ···, which may reduce the quality of the heated and fired product, and the raw materials S and S- The pipes 40, 40 · · · When traveling inside the partition chamber 60, 60 · · · inside the multi-partition partition structure 320, the raw materials S and S * '' interfere with each other's progress. This is not preferable because the inside of the tube bundle 300 may not be able to proceed smoothly.

[0513] The rotary kiln furnace 1 according to the present invention is a power that can be used for heating and baking treatment of various raw materials regardless of the components such as organic components and inorganic components. It is particularly preferable to treat paper sludge discharged from a paper mill as such a raw material, which is particularly preferred to be used in the process of removing the organic component by burning and recovering the remaining white inorganic component. .

[0514] The heat treatment apparatus provided with the rotary kiln furnace 1 in the present invention may be used alone as a heating / firing treatment apparatus to obtain a heated / firing treatment product, but as illustrated in FIG. 46 described above. After drying and granulating the raw materials, a heated and fired product may be obtained by performing a multiple-step heating and firing process such as primary and secondary. FIG. 46 is an example of a flow sheet in which various treatment steps are added to the front and rear stages of the heat treatment apparatus of the present invention. In the figure, the heat treatment apparatus of the present invention is shown as performing a secondary firing process. After obtaining the heat-fired product, further processing such as suspension, carbonation, dehydration, dispersion, and pulverization may be added as appropriate to obtain regenerated inorganic particles. Such various processing steps are used by appropriately adding or omitting them depending on the raw materials and the object to be obtained.

[0515] [Evaluation]

As described above, according to the present invention, the tube bundle 300 is configured so as to bundle the plurality of tubes 40, 40... As the rotating drum of the rotary kiln furnace 1. The indirect (inner) heating means l ib, which is the second heating means, is formed in the rotating moon inner cavity V in the central part of the rotating moon to improve the heat transfer efficiency. The heating and firing efficiency of the raw materials S and S 'can be improved.

[0516] Further, according to the present invention, a plurality of compartments 60 divided by the partition wall 50 in the pipe portions 40, 40 ··· in the pipe bundle 300 as the rotary drum of the rotary kiln furnace 1, 60 ··· By providing at least one partition wall structure 320 for multi-division, the raw material in each pipe 40, 40 · · · It is possible to greatly reduce the stacking of the materials s, s' ..., which can greatly improve the heat transfer efficiency and the contact efficiency between the raw material and the air for organic component combustion. Therefore, there is no residual unburned carbon, and the power to obtain a high-quality heated and fired product with high whiteness is possible. Even in a rotary kiln furnace with the same outer diameter, more raw materials can be obtained. It can be efficiently heated and fired.

[0517] Further, according to some embodiments of the present invention, a plurality of compartments 60 divided by partition walls 50 in each of the pipe parts 40, 40 ··· of the pipe bundle 300 of the rotary kiln furnace 1 are provided. , 60 ········································································· As a result, it is possible to feed the raw materials S and S '' 'into each of the compartments 60, 60 ... in the multi-partition partition structure 320, without introducing special equipment etc. By using the movement of the raw materials S, S ... that rotate and move inside the pipe sections 40, 40 ..., the multi-partition partition structure part 320 that follows the multi-partition partition structure part 310 is obtained. The raw materials S and S 'can be automatically and evenly supplied to the respective compartments 60 and 60.

Brief Description of Drawings

[0518] [FIG. 1] A view showing a basic flow sheet of a method for producing inorganic particles using the sludge of the present invention as a raw material.

FIG. 2 is a configuration diagram of an example of a heat treatment apparatus using an indirectly heated rotary kiln used in the heat treatment process of the present invention.

FIG. 3 is a configuration diagram of another example of a heat treatment apparatus using an indirectly heated rotary kiln used in the heat treatment process of the present invention.

FIG. 4 is a flowchart showing an example of a method for producing inorganic particles according to another embodiment of the present invention.

FIG. 5 is a schematic longitudinal sectional side view showing a first configuration example of a rotary kiln furnace used in another embodiment of the present invention.

FIG. 6 is a schematic longitudinal side view showing a second configuration example of the rotary kiln furnace.

FIG. 7 is a schematic vertical side view showing a third configuration example of the rotary kiln furnace.

FIG. 8 is a schematic perspective view showing a structural example of a rotating drum in the third configuration example. 9] A radial cross-sectional view showing a rotary barrel having a six-partition partition structure used in the rotary kiln furnace. 10] A radial cross-sectional view showing the rotation month of the June same-type multi-body structure used in the same rotary kiln furnace. 11] A radial sectional view showing a rotary cylinder having a 12-partition partition structure used in the rotary kiln furnace.

FIG. 12 is a schematic longitudinal side view showing a fourth configuration example of the rotary kiln furnace.

13] A configuration diagram of an example of a heat treatment apparatus including a rotary kiln furnace according to another embodiment of the present invention.

14] A partially longitudinal side view showing the structure of the rotary drum in the rotary kiln furnace shown in FIG.

FIG. 15 is a radial cross-sectional view of an example of a six-partitioned, small-partition partition structure.

16] / 3 — β ′ radial cross-sectional view of Fig. 14 when an example of a multi-partition partition structure with 18 compartments (18-part multi-partition structure) is used, (a) is each section A sectional view showing a room. (B) is a sectional view showing each set of compartments.

[Fig.17] / 3 — 13 'radial cross-sectional view of Fig. 14 when using an example of a multi-partition partition structure with 24 compartments (24-part C-type multi-partition partition structure) Sectional view showing each compartment, (b) Cross section showing each compartment set.

[Fig.18] / 3 — β 'radial cross-section of Fig. 14 when using an example of a multi-partition partition structure with 24 compartments (24-part B-type multi-partition structure) Sectional view showing each compartment, (b) Cross section showing each compartment set.

[Fig.19] / 3 — β ′ radial cross-sectional view of Fig. 14 when using an example of a multi-partition partition structure with 36 compartments (36-partition multi-partition structure), (a) Sectional view showing compartments, (b) Cross-sectional view showing each compartment set.

FIG. 20 is a partially longitudinal side view showing another example of the structure of the rotary drum in the rotary kiln furnace shown in FIG.

FIG. 21 is a partially longitudinal side view showing still another example of the structure of the rotary drum in the rotary kiln furnace shown in FIG.

[FIG. 22] An example of forming a multi-partition partition wall structure by combining compartment chamber structures, (a) is an exploded radial cross-sectional view, and (b) is a radial cross-sectional view after joining.

23] An example of forming a multi-partitioned partition wall structure by dividing the compartment into a compartment and dividing it into compartments, (a) is a radial sectional view during assembly, (b) is after assembly Diameter Cross-sectional view.

FIG. 24 is an example of a flow sheet in which various treatment steps are added to the former stage and the latter stage of the heat treatment apparatus of the present invention.

25] A conceptual diagram showing the stacking of the raw materials in the rotating month when the raw materials are put into the rotating month without a divided partition structure.

Gon 26] A conceptual diagram showing the state of raw material lamination in an example in which a six-partition partition wall structure is used for the rotating drum.

27] A conceptual diagram showing the state of raw material lamination in an example in which an 18-divided multi-divided partition wall structure is simply used for the rotating drum.

FIG. 28 is a conceptual diagram showing a stacked state of raw materials in each compartment of the 18-divided multi-partition partition structure when the 6-divided sub-partition structure and 18-part multi-partition structure are connected.

FIG. 29 is a conceptual diagram showing the lamination state of the raw materials in each compartment of the 36-divided multi-partition partition structure when the 6-divided sub-partition partition structure and the 36-divided multi-partition partition structure are connected.

FIG. 30 is a conceptual diagram showing an example in which an introduction pipe is used as an example of a raw material introduction means to the multi-partition partition structure in the rotating drum.

31] A configuration diagram of an example in which a tubular member and indirect (inner side) heating means are provided at the center of the rotating drum in the example shown in FIG.

FIG. 32 is a radial cross-sectional view of the rotary drum of the rotary kiln furnace shown in FIG. 31 (for example, when the multi-partition partition structure 120 is an 18-part multi-partition structure).

FIG. 33 is a partially longitudinal side view showing an example of the structure of the rotary drum in the rotary kiln furnace of the example in which a tubular member is provided at the center of the rotary drum of the example shown in FIG.

FIG. 34 is a diagram for explaining another embodiment of the present invention, in which raw materials are fed into the rotating moon composed of a single cylindrical tube portion. The conceptual diagram which shows a lamination | stacking state.

[FIG. 35] (a) Cross-sectional view of a 6-tube type tube bundle in a rotating drum (tube bundle) composed of a plurality of pipes, (b) Raw materials in the pipes when the raw materials are charged FIG.

[Fig. 36] (a) Cross-sectional view of a 21-tube type tube bundle in a rotating drum (tube bundle) composed of a plurality of pipes, (b) Raw materials in the pipes when the raw materials are charged FIG. FIG. 37 is a configuration diagram of a tube bundle (a) a tube, (b) a tube fixing member, and (c) a tube bundle composed of each member.

[FIG. 38] (a) Radial cross-sectional structure diagram of the tube bundle at the α 1 — α 1 ′ cut surface of the tube bundle illustrated in FIG. 37, (b) The conceptual diagram of the lamination | stacking state of a raw material.

FIG. 39 is a (a) radial cross-sectional view of the tube bundle bundle at the α 2 -α 2 ′ cut surface of the tube bundle illustrated in FIG. 37, and (b) the inside of the tube portion when the raw materials are charged. The conceptual diagram of the lamination | stacking state of a raw material.

FIG. 40 is a configuration diagram of a tube bundle having a multi-partition partition structure (a) a tube, (b) a tube fixing member, and (c) a tube bundle composed of each member.

41] (a) Radial cross-sectional structure diagram of the pipe bundle in the << 3-«3 'cutting plane 3 of the pipe bundle having the multi-partition partition structure illustrated in FIG. 40, (b) Schematic diagram of the stacked state of raw materials in the pipe when it is charged.

42] << 4 — << 4 'cut surface (a) radial cross-sectional structure diagram of the tube bundle, (b) input raw materials, with the multi-partition partition structure illustrated in Fig. 40 The conceptual diagram of the lamination | stacking state of the raw material in a pipe part at the time of doing.

Sono 43] A longitudinal side view of an example of a heat treatment apparatus provided with the rotary kiln furnace of the present invention.

FIG. 44 is a partially longitudinal side view showing the structure of the heating means in the rotary kiln furnace shown in FIG.

FIG. 45 is a configuration diagram of a tube bundle having a hollow tube at the center (a) a tube, (b) a tube fixing member, and (c) a tube bundle composed of each member.

[FIG. 46] An example of a flow sheet in which various treatment steps are added to the front and rear stages of the combustion apparatus of the present invention. 47] Partial longitudinal section showing an example of the structure of a bundle of pipe parts in the rotary kiln furnace shown in FIG. Side view.

FIG. 48 is a partially longitudinal side view showing the structure of another example of a bundle of pipe parts in the rotary kiln furnace shown in FIG. 43.

FIG. 49 is a partial longitudinal side view showing the structure of still another example of the tube bundle in the rotary kiln furnace shown in FIG. 43.

50] (a) Cross-sectional view of a 21-tube-type tube bundle in a rotating drum (tube bundle) consisting of a plurality of tubes and having a rotating drum cavity in the center, (b) Tube Overview of the lamination state of raw materials Intent.

51] An example of forming a multi-partition partition structure having a plurality of compartments by putting a partition wall (multi-partition partition) in the pipe part of the pipe bundle (a) Assembling radial cross-sectional view, (after assembly FIG.

FIG. 52 is a cross-sectional structure of an example in which a lifting plate is provided on the inner wall of the tube bundle and the surface of the partition wall. FIG. 52 (a) Diameter of an example in which a lifting plate is provided in the non-contained part of the partition wall structure portion for multi-division Cross-sectional structure diagram of direction, (b) radial cross-sectional structure diagram of an example provided with a lifting plate in the multi-partition partition structure. [53] An example of a driven rotary multi-partition partition (without dam structure) (a) perspective view, (b) radial cross-sectional view.

54] Inside the pipes 4, 4 ... when the raw materials S, ε ... are put into the pipes 4, 4 ... with the driven rotary multi-partitioning partition 50s illustrated in Fig. 53 The conceptual diagram of the lamination | stacking state of the raw material. [55] An example of a driven rotary multi-partition partition (an improved structure with a weir) (a) perspective view, (b) radial cross-sectional view.

37] Another example of a driven rotary multi-partition partition (an improved structure with a weir) (a) perspective view, (b) radial cross-sectional view.

57] Stacking of raw materials in the pipes 40, 40 ... when the raw materials S, S ... are put into the pipes 40, 40 ... having the driven rotary multi-division partition 50sl illustrated in Fig. 55 Conceptual diagram of the state.

[FIG. 58] An example of forming a multi-partition partition structure having a plurality of compartments by inserting a driven rotary multi-partition partition in the pipe part of the bundle of pipe parts (a) Radial cross-sectional view during assembly, (b) Radial sectional view after assembly.

Claims

The scope of the claims

[1] Sludge as a raw material, supplied from a sludge supply port installed at one end of the heat treatment apparatus, and a sludge discharge port installed at the opposite end in the sludge movement direction with respect to the sludge supply port A method for producing inorganic particles comprising a heat treatment step in which heat treatment is performed by an indirect heating method in an excess air atmosphere during removal from the air, and the air flow for transporting unburned matter is discharged from the heat treatment device during the heat treatment step. A method for producing inorganic particles, characterized in that unburned matter is taken out on the air flow for conveying unburned matter and removed to remove sludge force.

2. The method for producing inorganic particles according to claim 1, wherein the heat treatment apparatus is cylindrical.

Yes

[3] The method for producing inorganic particles according to [1], wherein the heat treatment apparatus comprises a single straight tubular cylindrical furnace.

[4] The method for producing inorganic particles according to [1] or [3] above, wherein the unburned matter is carbide particles.

[5] In the heat treatment step, forcibly exhausting the unburned matter conveying air stream from the vicinity of the sludge supply port, according to any one of claims 1 to 5. A method for producing organic particles.

[6] The air according to any one of claims 1 to 5, wherein air for generating the air flow for conveying the unburned matter is sucked from an air supply port provided in the vicinity of a sludge discharge port of the heat treatment device. The method for producing inorganic particles according to any one of the preceding claims.

7. The method for producing inorganic particles according to any one of claims 1 to 6, wherein the heat treatment apparatus is a cylinder and the inside of the cylinder is divided.

8. The method for producing inorganic particles according to claim 2 or 7, wherein the cylindrical heat treatment apparatus is a rotary kiln furnace.

[9] The heat treatment step is performed at a sludge temperature of 600 to 850 ° C.

The method for producing inorganic particles according to any one of 1 to 8.

[10] The method for producing inorganic particles according to any one of [1] to [9], wherein in the heat treatment step, calcium carbonate in the sludge is decomposed to exceed 50%.

[11] After the heat treatment step, the calcined product obtained in the heat treatment step is mixed with water and stirred to form a calcined product suspension, and carbon dioxide is added to the calcined product suspension. The method for producing inorganic particles according to any one of claims 1 to 10, further comprising a carbonation step of bringing the carbon dioxide into contact with each other.

[12] Sludge is supplied from the sludge supply port at the end of the cylindrical heat treatment apparatus in the cylinder axis direction, and the sludge discharge port installed at the end opposite to the sludge supply port in the cylinder axis direction. A cylindrical heat treatment apparatus that performs heat treatment by an indirect heating method in an excess air atmosphere during removal, and has an exhaust means near the sludge supply port for generating an unburned material carrying air flow. An incinerator particle production plant comprising a heat treatment device configured to discharge an unburned material conveyance air flow so as to be taken out from the fired material sludge after heat treatment.

[13] Inorganic particles produced by the production method according to any one of claims 1 to 11.

[14] A paper using the inorganic particles according to claim 13 as a filler.

[15] A coated paper using the inorganic particles according to claim 13 as a pigment.

[16] A method for producing inorganic particles by using papermaking sludge as a raw material and carrying out a combustion treatment while being transferred in a cylindrical heat treatment furnace,

The combustion treatment includes a primary combustion process in which flammable organic components in the sludge are burned and removed under an excess air atmosphere at a sludge temperature of 650 ° C. or lower, and a sludge temperature at 700 to 850 ° C. in an excess air atmosphere. A method for producing inorganic particles, wherein the method comprises at least two stages of combustion steps including a secondary combustion step of burning and removing non-combustible organic components.

17. The method for producing inorganic particles according to claim 16, wherein the cylindrical heat treatment furnace is a rotary kiln furnace.

18. The method for producing inorganic particles according to claim 16 or 17, wherein the combustion treatment is performed by indirect heating.

[19] The method for producing inorganic particles according to any one of [16] to [18], wherein the at least two stages of combustion steps are set during a transfer process of one cylindrical heat treatment furnace.

[20] The method according to claim 16, wherein air in the furnace is forcibly discharged from the raw material supply port side at one end of the cylindrical heat treatment furnace, and air is sucked into the furnace from the fired product discharge port side at the other end. The manufacturing method of the inorganic particle as described in any one.

21. The method for producing inorganic particles according to claim 20, wherein air is sucked into the furnace at the transition from the 17 fire combustion process to the secondary combustion process in addition to air suction from the fired product discharge port side.

[22] The method for producing inorganic particles according to any one of [18] to [21], wherein the indirect heating section for the seven-fire combustion process and the indirect heating section for the secondary combustion process are separated.

23. The method for producing inorganic particles according to any one of claims 16 to 22, wherein an alkali metal compound is added to the raw papermaking sludge.

24. The method for producing inorganic particles according to any one of claims 16 to 23, wherein the raw paper sludge is granulated or formed into a lump shape.

25. The method for producing inorganic particles according to any one of claims 16 to 24, wherein 50% or more of calcium carbonate contained in the raw papermaking sludge is decomposed by the combustion treatment.

[26] A suspension process in which the fired product after the combustion treatment is mixed with water and stirred to form a suspension, and carbonation treatment is performed by bringing carbon dioxide into contact with the suspension to obtain a carbonated product. The method for producing inorganic particles according to any one of claims 16 to 25, comprising a step and a pulverizing step of pulverizing the carbonized product.

[27] A cylindrical heat treatment furnace having one end side as a raw material supply port and the other end side as a fired product discharge port, a raw material supply means for supplying papermaking sludge to the raw material supply port, and the supplied sludge as a fired product discharge A transfer means for transferring to the outlet side, an indirect heating means for bringing the inside of the cylindrical heat treatment furnace into a combustion state, and an air supply means for making the inside of the cylindrical heat treatment furnace an excess air atmosphere,

In the cylindrical heat treatment furnace, a seven-fire combustion section with a sludge temperature of 650 ° C or less and a secondary combustion section with a sludge temperature of 700 to 850 ° C are configured,

The air supply means forcibly exhausts the air in the furnace from an exhaust port provided in the vicinity of the raw material supply port of the cylindrical heat treatment furnace, thereby providing an air supply port force provided in the vicinity of the fired product discharge port of the cylindrical heat treatment furnace, Inorganic particle production plant that draws air into the furnace.

[28] The rotary kiln furnace according to claim 8 or 17, wherein the rotary kiln furnace is provided with a rotary drum inside, and the raw material charged from one side is fired. A multi-partition wall provided with a divided chamber composed of at least two layers of a divided chamber group of the outermost layer region and a divided chamber group of the central region in the radial direction of the rotary drum A rotary kiln furnace with at least one structure.

[29] The multi-partition partition structure is configured by at least one compartment that constitutes the compartment group of the central region and at least two or more compartments that constitute the compartment chamber group of the outermost layer region. 29. The rotary kiln furnace according to claim 28, wherein the rotary kiln furnace is a multi-partition partition wall structure configured to be provided with a plurality of compartments having a certain shape.

[30] A cross section of the multi-partition partition wall structure portion has a substantially regular hexagonal outline, and the cross section of the outline of the substantially regular hexagonal outline is divided into a center of a substantially regular hexagon and six The interior of the approximately regular hexagon is divided into six approximately regular triangular compartments (hereinafter referred to as 6 divisions-abbreviated as the regular triangle type compartments) by the straight line connecting the vertices of An approximately regular triangular shape of the 6-divided-triangular shaped compartment by the three straight lines that connect the approximate center of gravity of the approximately triangular shape of the regular triangular compartment and the approximately midpoint of the three sides substantially perpendicular to each other. 30. The rotary kiln furnace according to claim 28 or 29, which is a cross-section of a multi-partition partition wall structure divided into 18 compartments as a total number of divisions by dividing the chamber into three substantially concentric square compartments.

[31] The cross section of the multi-partition partition wall structure portion has a substantially regular hexagonal outline, and the cross section of the outline of the substantially regular hexagonal outline is divided into a center of a substantially regular hexagon and six The interior of the approximately regular hexagon is divided into six approximately regular triangular compartments (hereinafter referred to as 6 divisions-abbreviated as the regular triangle type compartments) by the straight line connecting the vertices of Three straight lines connecting the approximate midpoints of each side of the regular triangle of the regular triangular compartment, and the four regular joints of the six-segment type-triangular compartment are roughly congruent. 30. The rotary kiln furnace according to claim 28 or 29, wherein the rotary kiln furnace is a cross section of a multi-partition partition wall structure divided into 24 compartments as a total number of divisions by dividing into square compartments.

[32] A cross section of the multi-partition partition wall structure portion has a substantially regular hexagonal outline, and a cross section shape that divides the inside of the substantially regular hexagonal outline and the center of the substantially regular hexagonal shape The interior of the approximately regular hexagon is divided into six approximately regular triangular compartments (hereinafter referred to as 6 divisions-abbreviated as the regular triangle type compartments) by the straight line connecting the vertices of The regular triangle of the regular triangular compartment is divided into three compartments by three substantially congruent regular triangles and one hexagon to form four compartments. Partition structure divided into 24 compartments as the total number of divisions by dividing the triangle into compartments so that the triangle occupies each corner of the 6-divided-regular triangle compartment 30. The rotary kiln furnace according to claim 28 or 29, which is a partial cross section.

[33] The cross section of the multi-partition partition wall structure portion has a substantially regular hexagonal outline, and the cross section shape that divides the inside of the outline of the substantially regular hexagon is the center of the substantially regular hexagon and 6 The interior of the approximately regular hexagon is divided into six approximately regular triangular compartments (hereinafter referred to as 6 divisions-abbreviated as the regular triangle type compartments) by the straight line connecting the vertices of The regular triangle of the regular triangular compartment is divided into three compartments by three roughly congruent regular triangles and three roughly congruent diamonds, and the three roughly congruent The partition structure is divided into 36 compartments as the total number of divisions by dividing the diamond so that each diamond occupies each corner of the 6-divided-regular triangular compartment. 30. The rotary kiln furnace according to claim 28 or 29 having a cross section.

34. The rotary drum according to any one of claims 28 to 33, wherein the rotary drum is a rotary drum further having a small-divided partition wall structure portion having a single-layered compartment group on the side of the raw material in the multi-partition partition wall structure. A rotary kiln furnace according to any one of the preceding claims.

35. The rotary kiln furnace according to claim 34, wherein a section of one compartment of the subdivided partition wall structure portion has substantially the same cross-sectional shape as an outer shell of the set of compartments having a fixed shape.

[36] The subdivided partition wall structure portion has a substantially regular hexagonal outline substantially the same as the multi-partition partition structure portion, and the cross-sectional shape dividing the inside of the substantially regular hexagonal outline is The inside of the substantially regular hexagon is divided into six generally regular triangular compartments (six divisions-abbreviated as regular triangular compartments) by a straight line connecting the center of the substantially regular hexagon and each of the six vertices. 36. The rotary kiln furnace according to claim 34 or 35.

[37] The rotary drum further includes one or more sets of a combination of a second subdivided partition structure portion and a second multipartition partition structure portion on the side opposite to the raw material charging direction of the multipartition partition structure portion. 37. The rotary kiln furnace according to any one of claims 34 to 36, wherein the rotary kiln is a rotating cylinder.

38. The rotary kiln furnace according to claim 28, wherein the plate material constituting the divided partition wall structure portion is a perforated metal plate.

[39] A rotary drum for housing a heating means for heating the rotary drum from the inside, surrounded by a group of compartments in the central region of the rotary drum of the rotary kiln provided with the multi-partition partition structure 39. The rotary kiln furnace according to any one of claims 28 to 38, wherein the rotary kiln has a hollow portion in the vicinity of a rotation center of the rotary drum.

[40] The rotary kiln furnace according to any one of claims 28 to 39, further comprising an exhaust means around one end on the raw material supply port side of the rotary kiln furnace as air introduction means to the rotary kiln furnace. A heat treatment apparatus equipped with a rotary kiln furnace.

[41] A heat treatment apparatus having a rotary kiln furnace, further comprising a heating means for indirectly heating and baking the supplied raw material to the rotary kiln furnace according to any one of claims 28 to 39. .

[42] The two heating means are provided, the first heating means is a heating means for heating from the outside of the rotary drum of the rotary kiln furnace, and the second heating means is the rotary drum inside the rotary drum. 42. A heat treatment apparatus provided with a rotary kiln furnace according to claim 41, which is a heating means for heating from the inner cavity.

[43] The rotary kiln furnace according to any one of claims 28 to 39, further comprising means for granulating the supplied raw material so that the raw material has a diameter or length of 2 to 30 mm. Heat treatment equipment with kiln furnace.

44. The heat treatment apparatus provided with the rotary kiln furnace according to any one of claims 40 to 43, wherein the raw material supplied to the rotary kiln furnace is paper sludge.

[45] The rotary kiln furnace according to claim 8 or 17, wherein the rotary kiln furnace is provided with a rotary drum inside, and the raw material charged from one side is fired, and the rotary drum includes the raw material therein. A plurality of tube portions that pass through the tube, and the plurality of tube portions form a tube bundle that forms the outer periphery of the rotating drum, and at the same time, contain heating means for heating the rotating drum from the inside. A rotary kiln furnace that forms a cavity inside the rotary drum.

[46] The rotary kiln furnace according to claim 8 or 17, wherein the rotary kiln furnace is provided with a rotary drum inside, and the raw material charged from one side is fired. The pipe part has at least one multi-partition partition structure part for dividing the inside thereof into a plurality of compartments by partition walls, and further comprising the plurality of pipes The section is a rotary kiln furnace that forms a tube bundle that forms the outer periphery of the rotating drum.

47. The rotary kiln furnace according to claim 45, wherein the pipe part has at least one multi-partition partition structure part for dividing the inside thereof into a plurality of compartments by partition walls.

[48] The partition wall structure section for multi-division is provided radially from the approximate center of the cross section of the pipe section in the outline direction. 48. The method according to claim 46 or 47, further comprising a plurality of partition walls, wherein the inside of the pipe part is divided into a plurality of partition chambers by the partition walls and the tube wall of the pipe part, and the sectional shapes of the partition chambers are substantially congruent. Rotating kiln furnace.

[49] The rotary kiln furnace according to any one of claims 45 to 48, wherein a lifting plate is provided on an inner wall of the pipe part and / or a partition wall of the multi-partition partition structure.

50. The rotary kiln furnace according to any one of claims 45 to 49, wherein the cross-sectional shape of the tube portion is substantially circular, substantially elliptical, or substantially polygonal.

[51] The outer diameter of the pipe section is 1/8 to 1/2 of the outer diameter of the cross section of the bundle of pipe sections.

50! /, The rotary kiln furnace according to any one of the above.

[52] The multi-partition partition structure part according to any one of claims 47 to 51, wherein the pipe part has a multi-partition partition structure part so that there is no multi-partition partition structure part on the side of the raw material input direction of the multi-partition partition structure part. The rotary kiln furnace as described in the paragraph.

[53] The pipe portion is a combination of the second multi-divided partition wall structure portion and the second multi-divided partition wall structure portion on the side opposite to the raw material charging direction of the multi-divided partition wall structure portion. 53. The rotary kiln furnace according to claim 52, wherein the rotary kiln is a tube portion further having at least one set.

54. The rotary kiln furnace according to any one of claims 48 to 53, wherein the multi-partition partition structure part is formed by inserting a driven rotary multi-partition partition member into a pipe part.

55. The rotary kiln furnace according to any one of claims 46 to 54, wherein the driven rotary multi-partition partition member has a structure including a damming member in the vicinity of a tip end portion of the partition plate portion.

[56] The rotary kiln furnace according to any one of claims 46 to 55, wherein the partition wall plate material constituting the multi-partition partition wall structure portion of the pipe portion is a perforated metal plate.

[57] The rotary kiln furnace according to any one of claims 45 to 56, further comprising an exhaust means around one end of the rotary kiln furnace on the raw material supply port side as air introduction means to the rotary kiln furnace. A heat treatment apparatus equipped with a rotary kiln furnace.

[58] A heat treatment apparatus having a rotary kiln furnace, further comprising heating means for indirectly heating and baking the supplied raw material to the rotary kiln furnace according to any one of claims 45 to 57. .

[59] comprising two heating means, wherein the first heating means constitutes the rotary drum of the rotary kiln furnace 59. The rotating kiln according to claim 58, wherein the rotating kiln is a heating means for heating from the outside of the tube bundle bundle, and the second heating means is a heating means for heating from the hollow portion in the rotating body inside the tube bundle bundle. Heat treatment equipment with a furnace.

[60] The rotation according to any one of claims 45 to 59, further comprising means for granulating the raw material supplied to the rotary kiln furnace so that the diameter or length of the raw material is 2 to 30 mm. Heat treatment equipment with kiln furnace.

61. The heat treatment apparatus provided with the rotary kiln furnace according to any one of claims 45 to 60, wherein the raw material supplied to the rotary kiln furnace is paper sludge.